Group Classes in a Clinic: Do the Numbers Actually Work?

A group class earns you only the difference between what the room takes and what that hour would have earned anyway. Divide your revenue per bookable hour by your price per head and you get the number of people who have to turn up. On West Hertfordshire Hospitals NHS Trust's published private physiotherapy prices, a physio-led class at £13.33 a head needs six people to beat a 45-minute follow-up at £72.50, in a class capped at six. The class pays only when it is full, and the usual fix is not a bigger class. It is a different person teaching it.

Classes are the one service in allied health that breaks the one-patient-per-slot ceiling, which is why they get recommended so freely. They are also the one where the published prices make no sense at all.

What do UK clinics actually charge for a physio-led class?

Between about £6.90 and £50 a head for a single class. That is more than a sevenfold spread on the same nominal service.

All of these came off the clinics' own live price pages on 9 October 2026.

Two things fall out of that table before any arithmetic.

The cheapest option per head is the one with no room at all. LB Physio's online class is a tenth of the price of a London duet, and the difference is almost entirely that nobody is standing in a building.

And the prices do not sort by class size the way you would expect. A London duet at £50 a head is dearer than a London three-to-one at £45, which is dearer than a Norfolk four-to-one at £35. Smaller classes cost more per person, which means the revenue per hour of the small, premium class is lower than you would guess: two at £50 is £100, three at £45 is £135.

Nuffield Health Leeds adds a detail worth copying. Every participant needs an initial assessment with a physiotherapist before joining, at £42 for non-members and £32 for gym members. That assessment is billable income in its own right, and it is doing a second job that the rest of this article comes back to.

What is the break-even head count?

One division. Your revenue per bookable hour, divided by your price per head.

Revenue per bookable hour is not your fee. It is your fee, times the number of appointments you fit into an hour, times the share of those slots that actually get delivered. The UK Private Practice Barometer 2026, a self-reported survey of 715 UK clinic owners, puts average diary utilisation at 72.3%, which is the figure our guide to diary utilisation works through in detail.

That fill rate matters more than anything else in the model, because it cuts the thing the class has to beat.

Read the last two columns against the cap.

At a full diary, four of these seven formats need every single seat filled, and one of them needs more seats than the class has. A London duet at £50 a head takes £100 an hour against a one-to-one at £110. Two people, both paying, both attending, and the studio is still £10 an hour down on simply seeing one of them privately. The duet exists because clients want to train with a friend, not because it earns more.

At the UK average diary, every one of those formats clears break-even with a seat or two spare. That is the whole inversion: classes look best in the practices least sure they need them, and worst in the practices that feel busy enough to run them. This is the same trap as add-on services generally, where a machine in a full diary earns only the premium over the appointment it displaces, and it bites harder here because a class blocks a whole hour rather than one slot.

Two honest caveats. The class's own fill rate varies too, so the fair comparison is expected heads against expected hourly revenue, not full class against full diary. And the clinics above use different fee bases, so these columns compare each clinic with itself rather than with each other.

How many people does your treatment room actually hold?

Fewer than the break-even, usually. This is the constraint nobody models, and a tape measure settles it in two minutes.

A standard exercise mat is about 1.8m by 0.6m. A person on it needs clear arm span to both sides and clearance at the head and feet, so the working envelope per participant is roughly 2m by 1.7m, about 3.4m² of floor. The instructor needs a lane to walk and kneel in.

A typical UK treatment room is around 3m by 4m, so 12m².

• Couch still in the room: two participants, three if the couch folds away
• Couch out, nothing else in the room: three, four at a squeeze
• Six participants: you need roughly 20m² of clear floor, which is a studio, not a treatment room

Now put that next to the break-even table. West Herts needs six heads at a full diary and caps the class at six, which only works because it is run in a hospital physiotherapy gym. A clinic trying to copy that price in a 12m² treatment room has a break-even of six and a ceiling of four. The price is not wrong because it is too low. It is wrong for the room.

If you are weighing a class against other uses of the same space, our guide to how many practitioners one treatment room supports has the capacity arithmetic for the clinical alternative.

Why does who teaches it change the answer more than the price does?

Because your own clinical hour is the most expensive input in the building, and a class is the only service where you can take it out of the equation.

There are two completely different models here, and most clinics never separate them.

Model A: you teach it. The class competes directly with your own clinical hour. Break-even heads is revenue per bookable hour divided by price per head, which is the table above.

Model B: you pay someone else to teach it. Your hour is freed to run clinic as normal, so the class no longer competes with you. It competes only with the instructor's cost and with whatever else the room would have earned at that time. Break-even heads becomes instructor cost per hour, divided by price per head.

Work it on the West Herts price of £13.33 a head, with an instructor at £30 an hour. That £30 is an assumption, not a benchmark: there is no reliable published UK figure for what a clinic pays a Pilates instructor an hour, and the aggregator data we found rests on single-digit sample sizes from 2023. Get two quotes and use the real number.

Hiring the instructor halves the break-even head count, from six to three. It also turns the three-head class from a £32.50 hourly loss into a £10 hourly gain. The instinct of an owner-practitioner is that paying someone else is a cost they cannot justify until the class is busy. The arithmetic says the opposite: paying someone else is what makes a quiet class survivable long enough to become busy.

Model B holds only if two things are true. Your own hour has to be genuinely billable at that time, otherwise you have paid £30 for nothing. And the room has to be free, otherwise the class is displacing a clinical hour anyway, just somebody else's.

A worked example where the class wins

Complete Pilates in Norfolk, on their published drop-in prices, with the owner teaching.

• One-to-one, 55 minutes, drop-in: £75
• Four-to-one, 50 minutes, drop-in: £35 a head, capped at four
• Break-even: £75 ÷ £35 = 2.14, so three heads

A full class is worth £65 an hour more than the one-to-one it replaced. Over a ten-week term that is £650 from one hour a week, and the equipment is mats. This is the version of classes that people have in mind when they recommend them.

The reason it works is the ratio. £35 against £75 is a price per head at 47% of the one-to-one fee. At West Herts, £13.33 against £72.50 is 18%. Where your class price lands as a percentage of your one-to-one fee is the single most predictive number in the decision, and anything under about a quarter needs a studio to survive.

A worked example where it does not

The same clinic logic, West Herts pricing, owner teaching, four people in the room because that is what the treatment room holds.

• Hour of clinical time: one 45-minute follow-up at £72.50, plus turnover
• Class: four heads at £13.33 = £53.33
• Shortfall: £19.17 an hour

Run that weekly for a ten-week term and the class has cost £192 in displaced fees. That is survivable. What makes it worse is the part that does not show up as a number: the hour is advertised, so you cannot sell it to anyone else at short notice, and the four people in it are often the four most reliable rebookers in your diary, who would happily have paid for a one-to-one.

So the class did not add four patients. It converted four full-fee patients into quarter-fee patients and blocked the slot that would have held a fifth.

Why does the block discount quietly move the break-even?

Because almost every clinic sells classes in a block, and the block price is the one the break-even has to clear.

Complete Pilates Norfolk charges £35 a class on a drop-in, £25 a class in a block of five, and £20 a class in a block of ten. That discount is sensible: it buys commitment and it smooths the cash. It also raises the number of people who have to be in the room.

The ten-class block takes the class from needing three of four seats to needing four of four. Discounting a class by 43% does not cost you 43% of the margin. It can cost you all of it, because the break-even crosses the physical cap of the room.

Price the block first and the drop-in second, not the other way round. The block is what most people will actually buy.

What happens to no-shows in a class?

They stop mattering, and that is the quiet financial advantage nobody mentions.

The Barometer puts no-shows at 6.3% to 8% of booked appointments and cancellations at a further 9% to 10%, so roughly one in six booked one-to-one slots evaporates. Our guide to reducing no-shows covers what to do about that.

A pre-paid class block is structurally immune to it. The money arrived in week one. If someone misses week four, the class still runs, the other five still attend, and no revenue is lost. Complete Pilates reinforces this with expiry dates: a block of five expires in eight weeks, a block of ten in three months, a block of twenty in six months, so unused classes do not sit on the books forever.

The risk simply moves. A class does not die in the middle of a term. It dies at the end of one. Non-renewal is the number to watch, and it is invisible if you only count attendance, because attendance looks fine right up to the week the block runs out and four of the six do not buy another.

Track renewals per block, not heads per class.

What else does the class cost?

Three things, and only the first appears in most plans.

Equipment. Mat work is genuinely cheap: mats, bands, small balls, a couple of foam rollers, a few hundred pounds. Reformers are a different business. UK retail listings for studio reformers from Align-Pilates, a manufacturer based in Evesham, run from roughly £1,900 for a folding model to about £2,450 for a studio unit, so a modest row of eight is a five-figure fit-out before you have touched the room. (The retailer page blocked our fetch, so treat those two figures as indicative of UK retail rather than confirmed list prices.) If your practice is VAT exempt you cannot reclaim the VAT inside those prices, which makes the real cost about a fifth higher than it looks. Our guide to whether your practice is VAT exempt explains why.

The assessment gate. Nuffield Health Leeds requires a £42 physiotherapy assessment before anyone joins a class. That is sound clinically, it funds the acquisition of each class member, and it also does something to the tax treatment, below.

Insurance. For a Chartered Society of Physiotherapy member on full practising membership, the CSP states that Pilates and yoga "are covered by the CSP PLI scheme when used as part of physiotherapy practice", on condition that you conduct appropriate assessments, apply clinical reasoning and present yourself as a physiotherapist. The CSP says explicitly that you do not need additional insurance for this. Its page was last reviewed on 25 June 2026.

The warning in the same guidance is the one to read twice. The CSP cautions that its scheme "may not provide cover for any claim if you have taken out another policy for the same activities". Buying a separate Pilates instructor policy on top, as a belt-and-braces measure, can therefore work against you. If you are not a CSP member, or your instructor is not a physiotherapist, check what cover actually sits behind the class before the first session. Our guide to comparing indemnity providers covers how to read the exclusions.

Does class income change your VAT position?

It can, and this is the part that catches clinics in their second or third year of running classes.

There are two VAT exemptions that look as though they might apply to a class, and for a commercial clinic one of them does not.

The sport exemption is closed to you. VAT Notice 701/45 exempts certain supplies of sport and physical education, but only when the supplier is an "eligible body", which the notice defines as non-profit making with a non-distribution clause in its constitution. A limited company or sole trader running a clinic for profit is not an eligible body. Leisure trusts and non-profit clubs are. This is why a council leisure centre and the clinic next door can charge VAT differently for what looks like the same class.

So the only route is the healthcare exemption, in VAT Notice 701/57. That needs two things at once: the supply made by a practitioner on a statutory register named in the notice, and a supply whose primary purpose is protecting, restoring or maintaining health. Treatment passes the purpose test. General fitness does not.

Which means the structure of your class decides its tax treatment:

That middle row is the expensive one, because standard-rated income counts toward the £90,000 VAT registration threshold while exempt treatment income does not. A wholly exempt physiotherapy practice turning over £400,000 never has to register. The same practice with £95,000 of open fitness class income does. Classes and room rent are the two income lines most likely to drag an otherwise exempt practice into registration.

This is how the treatment generally works, not a ruling on your position. Decide the class structure with your accountant before the first term, not after a good year, because retrospective corrections on a service you have been advertising at a VAT-inclusive price are painful. Our guide to the healthcare exemption sets out the purpose test and the direct supervision conditions in full.

Where do the first six people come from?

From your own discharge list, not from the public.

This is the step that decides whether a class ever reaches its cap, and it gets skipped because filling a class feels like a marketing job. It is not. A new class advertised to the town competes with every gym, studio and leisure centre within three miles, on price, and you have read the prices above.

The people who join are the ones who have just finished a course of treatment with you and do not want to stop. They are already assessed, they already trust whoever is in the room, and the class is the obvious next thing to raise in the discharge conversation.

So build the term backwards:

1. Pick a start date eight weeks out, and a cap that matches the room rather than the break-even you would like.
2. Offer it at discharge from the day the date exists. One sentence in the last appointment: "The usual next step with this is a weekly class, and the next one starts on the 10th. Shall I put your name down?"
3. Keep a named list, with the block paid or a deposit taken. Expressions of interest fill nothing. Six people who are "definitely interested" produce three who turn up.
4. Ask the ones who say yes who they would bring. A friend joining is the cheapest acquisition in the whole model, and the strongest reason both of them keep coming.
5. Only then advertise it, to your own patient list first and the public second.

One timing constraint the break-even arithmetic hides. A class at 6pm fills easiest and displaces the hour your diary is most likely to sell at full fee. A class at 11am displaces an hour you may struggle to fill and is harder to fill with working people. If the class has to run at your peak hour, that is the strongest argument in this article for paying somebody else to teach it.

What does the admin actually take?

More than most plans allow for, because practice software is built around one patient in one slot.

Most clinic systems, Atlacare included, treat an appointment as one patient at one time. A class is six patients in one slot, so something has to give. Three workable ways round it:

• One appointment per participant in the same time slot. Each person keeps their record, their notes and their invoice, and the diary shows a wall of six bookings. Tedious, and correct.
• One blocked hour in the diary, with a register kept outside the system. The diary stays clean, but attendance and block renewal then live in a spreadsheet, and things that live in spreadsheets eventually live nowhere.
• A separate class booking tool alongside the clinical system, which solves the register and the payment and leaves you reconciling two lists.

Whichever you choose, four things need a home from the first term, because they are what a class is actually managed by:

1. Who has paid, and for how many classes. Pre-paid blocks are the financial advantage of the format, and they only work if the count is right.
2. When each block expires. That date is the renewal date, and renewal is the number this article keeps telling you to watch.
3. A register for every session, which also shows who has quietly stopped coming about three weeks before they mention it.
4. A note for each participant. A class delivered as part of treatment is treatment: screening, modifications, progressions and anything that happened on the night belong on that person's record, not only on the register.

Choose the method that keeps the clinical record intact, because the register you can rebuild and the record you cannot.

The failure mode: the three-head class

A class that runs at three heads instead of eight is usually worse than the appointment it replaced, and it is also the most common outcome.

If you teach it yourself at a typical UK clinic class price, three heads is a £30 to £40 hour where a £65 to £75 hour was available. It persists because nobody prices the hour it displaced, because the three who come are grateful and say so, and because cancelling a class feels like a failure in a way that discontinuing an unprofitable service does not.

Three honest exits.

Raise the price and shrink the cap. A three-to-one at £45 a head is a real service with real economics. A six-cap class running at three is a six-cap class running at three.

Hand it to an instructor. Three heads at £13.33 is £40 against a £30 instructor. It survives. You go back to clinic.

Stop it at the end of the term and put the hour back in the diary. Blocks make this easy, because there is a natural end point and nobody has to be told the class failed.

There is one case where a loss-making class is still the right call, and it is worth being precise about rather than hand-waving at. If the class is holding patients who would otherwise have finished and drifted, it is a retention cost, not a revenue line, and it should be measured as one: tag the class members and look at how many of them book a one-to-one in the following six months, and what their rebooking rate is against the rest of your list. The Barometer puts average rebooking at 73.3% with the top decile at 84.8%. If your class members are not above your own average, the class is not buying retention either.

What it must not be is a service you keep because stopping it would be awkward.

What to do before you advertise a class

Seven steps, in order. The first two are the ones that get skipped.

1. Measure the room. Floor length times width, minus the instructor's lane, divided by 3.4m² per person. That is your real cap, and it is lower than the number you had in mind.
2. Work out your revenue per bookable hour. Fee, times slots per hour, times your actual delivered fill rate. Not your headline fee.
3. Divide. Revenue per bookable hour ÷ price per head = break-even heads if you teach it. Instructor cost per hour ÷ price per head = break-even heads if you do not.
4. Compare break-even with the cap. If break-even is at or above the cap, the class only ever works full, which means it does not work. Change the price or change the room.
5. Set the block price first, then check the break-even again at the block price rather than the drop-in price.
6. Decide who teaches it before you set the price, because the two models have different break-even points and different answers.
7. Settle the VAT treatment with your accountant, and decide whether an assessment gate is part of the design.

Sanity check on the result: if your price per head is under about a quarter of your one-to-one fee, you need a studio. Between a quarter and a half, a decent room works. Above half, you are running a small-group service and the economics look after themselves.

Frequently asked questions

What is the minimum number of people needed to run a class?

Set the floor when you sell the block rather than on the night, and publish what happens if the class does not run: the session moves to the end of the block, or it is credited. Two or three is the usual minimum. Deciding it in advance turns a cancelled session into admin instead of an argument.

What time of day should a clinic class run?

In the hour the diary is least able to sell at full fee, which for most clinics is mid-morning or early afternoon. Evening classes fill fastest and cost the most in displaced one-to-one fees, which is why an evening class makes far more sense when somebody other than the owner teaches it.

Does a missed class have to be made up?

That is a policy choice, and a block with an expiry date settles it. Complete Pilates expires a block of five in eight weeks and a block of ten in three months, which allows some flexibility without leaving unused classes on the books indefinitely. Publish whichever rule you pick alongside the price.

Where the numbers come from

Two of the seven steps above need data most practices do not have written down anywhere: revenue per bookable hour, and whether class members rebook better than everyone else.

Atlacare lets you set a class up as its own service with its own fee, and Clinic Health tracks diary utilisation and rebooking as two of its six dimensions. Patient tags let you mark class members so you can find them as a group. Reporting is at practice level rather than per service, so the per-class contribution in the tables above is still arithmetic you do yourself, from the fee you set and the heads who turned up. New accounts are on the Free plan, which has no card and no time limit, and the Clinic plan at £49 a month covers three practitioners.

Measure the hour before you block it out for ten weeks.

Prices are taken from the named clinics' own published price pages on 9 October 2026 and are advertised rates, not survey data. They change without notice, so check the source before relying on any figure. Barometer figures are self-reported survey data from 715 UK clinic owners, not audited accounts. The instructor cost, room dimensions and fill rates in the worked examples are stated assumptions; substitute your own. This is general commercial information, not tax advice. VAT treatment depends on facts this article cannot see, and the notices change.

Sources: West Hertfordshire Hospitals NHS Trust, private physiotherapy prices · Complete Pilates prices · Nuffield Health, clinical Pilates in Leeds · LB Physio prices · CSP, Pilates and yoga insurance · VAT Notice 701/45, sport · VAT Notice 701/57, health professionals · UK Private Practice Barometer 2026

Related: Which add-on services actually pay? · What is a good diary utilisation rate? · How many practitioners can one treatment room support? · Is my practice VAT exempt? · Which six numbers should a clinic owner track?