Most personal trainers I talk to can quote their grocery bill to the dollar but have no idea what it actually costs them to land a client. That’s not a personality flaw — that’s the industry. Cert programs spend 400 pages on muscle anatomy and half a paragraph on margins. So trainers price the only way they know how — they look at what the gym down the street charges and add or subtract ten bucks.
That works until it doesn’t. And by the time it stops working, you’ve already burned through a year of your life building a business that can’t actually pay you.
Here are the three numbers that should be running your pricing. Not vibes. Not what your competitor charges. These three.
Number 1: Customer Acquisition Cost (CAC)
This is what it costs you, on average, to land one paying client.
Most trainers think CAC is just ad spend. It isn’t. It’s everything you spent in a given month divided by how many new paying clients you closed that month. That includes ad spend (Meta, Google, anything paid), time spent on free intro calls valued at your real hourly rate, software you used to manage the funnel (CRM, scheduler, email tool), the free month you gave away to a referral, and the discount you offered to close the deal.
If you spent $1,200 in a month on all of the above and signed 4 new clients, your CAC is $300. That’s not a guess. That’s math.
Key insight: If your CAC is $300 and your average client pays you $250 once and never comes back, you are losing money on every client you sign. You can be “fully booked” and still going broke. I’ve watched it happen.
Track CAC for 90 days minimum. Anything shorter is noise.
Number 2: Monthly Recurring Revenue Per Active Client (MRR/AC)
This is the average dollar amount each active client pays you per month. If you have 20 clients and your top-line monthly revenue is $9,000, your MRR per active is $450.
The reason this number matters: it tells you whether your pricing is built for a real business or a side hustle.
Most trainers I audit have an MRR/AC of $200-$300. That’s session-by-session pricing. The trainer thinks they’re charging $80 per session and the client comes 3 times a month, so that’s $240. But sessions get skipped. Vacations happen. Holidays happen. By the time you average it out across the year, you’re below $200/month per active.
At $200 MRR/AC, you need 50 active clients to gross $10K/month. Fifty. That’s not a coaching business — that’s a small group fitness gym with no walls. At $400 MRR/AC, you need 25 to gross the same $10K. Half the headcount. Half the management overhead. Half the churn risk.
Pricing model fixes that move the needle:
Move from per-session to monthly retainer with built-in session minimums. Add a hybrid model (in-person + check-ins + programming). Bundle nutrition, programming, and accountability into one monthly fee. Stop selling 10-packs that get used in 6 weeks then disappear.
For more on pricing models that scale, read the pricing mistakes killing personal training businesses.
Number 3: Client Lifetime Value (CLV)
This is the total dollar amount a client pays you across their entire relationship with your business. Calculate it by multiplying your MRR per active by your average client tenure in months.
If clients stay an average of 8 months and pay $400/month, your CLV is $3,200. If they stay 14 months at $500/month, your CLV is $7,000.
This is the number that lets you make every other decision in your business with clarity.
Should you spend $300 to acquire a client? If your CLV is $3,200, that’s a no-brainer — you’ll get an 11x return. If your CLV is $800, you’re underwater the moment you close them.
Should you offer a 90-day money-back guarantee? If your CLV is $7,000 and your refund rate is under 10%, the math works. If your CLV is $1,500, you’re betting the business on every refund.
Should you build a referral program that pays out $200 per signup? If your CAC is $400 and your CLV is $3,000, you just cut your CAC in half and bought yourself a lifetime customer for two hundred bucks. Yes. Always yes.
CLV is the lens that makes the rest of the business decisions obvious instead of agonizing.
A Real-Numbers Example
Let me run these for a fictional trainer named Sarah so you can see what it looks like in practice.
Sarah has 18 active clients. She charges $325/month for online coaching. She also does some hybrid in-person work that bumps a few clients to $500. Her actual monthly revenue from active clients is $6,750. Her MRR per active is $375 — past the session-pricing trap, but there’s room.
Last month she spent $400 on Meta ads, $80 on her CRM and email tools, and did 8 free intro calls (she values her hourly time at $100, so that’s $800 of soft cost). She closed 3 new clients. Her CAC is ($400 + $80 + $800) ÷ 3 = $427.
Her clients stick around about 7 months on average. Her CLV is $375 × 7 = $2,625. Operating equation: CLV ÷ CAC = $2,625 ÷ $427 = 6.1x.
That’s actually healthy. Sarah can spend more on acquisition with confidence. She can run promotions. She can hire a VA. The math gives her permission. But Sarah has been telling herself for months that her business “feels stuck.” That’s not a numbers problem — that’s a story problem. The numbers say: pour gas on the fire. The fear says: be conservative. Without the math, fear wins. With the math, the obvious play wins.
Now imagine the same Sarah but with 4-month average tenure instead of 7. Her CLV drops to $1,500. Her ratio falls to 3.5x. Still workable, but she’s now far more vulnerable to a slow ad month or a couple of refunds. The intervention is no longer “spend more on ads” — it’s “fix retention before scaling.”
The numbers don’t just tell you what’s broken. They tell you what to fix first.
Common Mistakes That Tank These Numbers
Three patterns I see destroy these metrics in coaching businesses:
Selling 10-packs at a discount. This compresses revenue into a single month, then leaves a long gap before the next purchase. It tanks MRR per active because clients use the pack in 6 weeks then go quiet. Worse, it trains the client to expect discounts, which kills price elasticity forever.
Refusing to raise prices on existing clients. Loyalty discounts are noble in theory and brutal in practice. A client paying $300/month from 2022 is dragging your MRR/AC down every month they renew at that rate. Build in annual increases or grandfather only your top tier.
Counting “almost-clients” in your math. Trial users, free month winners, friends-and-family rates — these inflate your active count and crater your MRR/AC. Active means paid full price in the last 30 days. That’s it.
How These 3 Numbers Work Together
CLV needs to be at least 3× your CAC for the business to be healthy.
If CLV is $3,000 and CAC is $300, you’re at 10x. You can pour gas on the fire — spend more on ads, hire help, expand. The math gives you permission.
If CLV is $1,500 and CAC is $700, you’re at roughly 2x. You’re surviving but not building wealth. Every new client costs you cash flow before they pay it back.
If CLV is $1,200 and CAC is $1,000, you’re underwater. It feels like growth because clients keep showing up. But you’re slowly bleeding out.
Most trainers fall in that second or third bucket and don’t know it because they’ve never run the math.
What to Do This Week
Pull the last 90 days of bank deposits, ad receipts, and client roster. Calculate all three numbers. It’ll take you 90 minutes. Then ask: at my current CAC and CLV, can I afford to invest in growth? Or am I one bad month from a cash crunch?
If the numbers don’t work, the answer is rarely “work harder.” The answer is usually “raise prices, lengthen the average client tenure, or lower acquisition cost.” All three are leverage. None of them require more hours.
Action step: Set a recurring calendar block — first Monday of every month, 60 minutes — to update these numbers. Just refresh the inputs and look at the trend line. Most trainers panic at the wrong moments because they’re working off vibes rather than data. A quick monthly check stops that.
The trainers who run their businesses on these numbers stop pricing on vibes. They make a price change once a quarter, with confidence, backed by data. Their clients respect them more for it. Their bank account respects them more for it. The ones who don’t — they keep wondering why they’re working 60 hours a week and still scraping by. You don’t have to wonder. Just run the math.