Scheduling and payments for personal trainers.

Before you build it, four documents about it: who else is already selling to the self-employed trainer with forty regulars and no front desk, one price you can defend, a money model with every guess labelled, and where the first customers are.

What it checks first, for this one.

1. What the incumbent trainer apps charge, and which of them take a cut of the session as well as a subscription
2. Whether the gyms they rent from already impose a booking system, which decides whether this is even installable
3. How they take money today — because a tool that does not replace the payment step replaces nothing

Does the fee survive being compared to a percentage cut the trainer already resents paying?