What Gym Should You Work For? A Decision Framework for Personal Trainers in San Francisco
Most advice on where to work as a trainer comes down to culture and vibe. Those matter, but they are not what determines whether you build a career or burn out in eighteen months. Four things do: how you get paid, what you can put in front of a client, where your next client comes from, and how much room you have to grow.
This is a framework for evaluating any gym in San Francisco. It is also an honest account of how Custom Fit is built against it, so you can decide for yourself.
1. Understand the compensation structure, not just the number
There are three common models in the Bay, and the headline percentage tells you almost nothing on its own.
Employee split. The gym sets the rate, you keep a percentage, and the gym handles billing, scheduling, and at least some client acquisition. Common splits run 40–60%. The trade is simple: you give up margin in exchange for not carrying overhead or chasing leads.
Independent rental. You pay for space or a membership and keep close to 100% of what you charge. The catch is that you find every client yourself and absorb every cost of running a business.
Hybrid. Some studios let you do both — take house clients on a split while running your own book as a renter under the same roof.
The right model depends entirely on your current book. A trainer with a full roster is losing money on an employee split. A trainer building from zero needs lead flow far more than a high percentage of nothing. The question to ask any gym is: at my current client count, which model nets me more — and can I move between them as I grow?
At Custom Fit: we offer both a competitive house split and an independent rental track, and you can run them in parallel. Our rates are structured to sit at the top end of what trainers earn in the Bay [confirm exact split % and rental pricing before publishing]. More important than the number is the flexibility — you are not locked into one model the day you sign.
2. Look hard at what you can actually offer a client
Your ceiling on rate is set by how much measurable value you can demonstrate. "Trust me, this works" is a low ceiling. "Here is your DEXA body composition, your VO₂ max, your resting metabolic rate, and your force-plate asymmetries — and here is the plan, with a re-test in twelve weeks" is a different conversation, and a different price point.
At most gyms that testing either does not exist, or it costs your client extra every single time. That friction quietly caps what you can charge.
At Custom Fit: testing is unlimited — DEXA scans, VO₂ max, and RMR — for our direct clients and for the clients you bring in as a rental trainer. That last part is the one most trainers don't believe at first. The private clients you walk in the door get the full testing suite at no added cost. It turns you into a data-driven coach overnight, with no capital outlay on your end. You do not buy a DEXA machine; you just use ours.
This is the core of how we think: eliminate the guesswork. It applies to client outcomes, and it applies just as well to your value as a coach.
3. Know where your next client comes from
Lead flow is the difference between a job and a treadmill. An employee position should come with it — house clients, walk-ins, a brand that markets itself. Be honest about whether a gym actually generates leads or simply hands you a desk and a key fob.
At Custom Fit: direct-client demand is driven by the brand, the locations, and an active content engine, and house clients are routed to trainers on the team. For renters, the testing suite above is itself an acquisition tool — it is a reason for a prospect to choose you over a coach down the street who cannot offer it [confirm how house leads are allocated to trainers before publishing].
4. Find out how much room you have to grow
A single-location gym with a fixed roster has a hard ceiling, and you will hit it. Ask what the path actually looks like two years out. Are there new rooms opening? Roles beyond the training floor? A reason to stay and build?
At Custom Fit: we are expanding across San Francisco — Hayes Valley, 1844 Market Street, a new location at 570 Battery Street, and a fourth opening Downtown. Growth means new client bases, new floors, and roles beyond one-on-one coaching: testing specialists, program leads, Run Club coaching, nutrition, and location-level operations. The ceiling moves as the company does.
5. Measure how close you are to the people making decisions
At a big-box gym you are a line on a roster managed by a regional office. Owner proximity is the opposite: when you have an idea for a program, a client, or a process, it reaches a decision-maker the same day.
At Custom Fit: owners are on the floor, not behind a corporate wall. You have a direct line to the people who run the company, and good ideas move fast because there is no chain to climb.
Who this is actually right for
This is not the right fit for everyone, and it shouldn't be. If you want to clock in, run sessions off a template, and clock out, there are easier places to do that.
It is the right fit if you want to build a real book, charge what data-backed coaching is worth, and grow with a company that is still expanding. State-of-the-art equipment, the full testing suite for every client you serve, top-of-market pay structures, and direct access to ownership — that is the offer.
If that is the kind of practice you are trying to build, let's talk.