Define the decision
Start with goals, current activity, training history, health concerns, schedule, preferences and the setting in which you feel comfortable. A coach can then observe basic movement at a suitable level, without turning the consultation into a test of toughness.
What to ask and observe
The trainer should explain what they noticed in plain language and propose an initial plan: frequency, exercise categories, starting effort and review date. If a movement causes pain, it should be modified or stopped; a coach should not tell you that pain proves the session is working.
Make the choice work downtown
Before paying, obtain the location, session duration, coach identity, total cost, expiry and cancellation terms in writing. If they cannot say what the first month contains, the offer is not yet clear enough to compare.
What to bring
Bring a concise account of your goal, prior exercise, current schedule, equipment access and what has made earlier routines difficult. You can also note movements that feel uncomfortable and questions you want answered. The trainer may ask for relevant health information to plan safely, but you should understand why it is needed, who can see it and how it will be stored.
Watch the response to feedback
The most useful test is not whether you perform an unfamiliar movement perfectly. Notice whether the coach changes an instruction when it does not make sense, offers another setup and checks your understanding. A first session should leave you able to explain what was practised and what comes next. Pressure to finish a maximal workout before discussing your starting point is a poor assessment process.
Leave with a concrete next step
Ask for a written outline of the first four weeks, a price that includes every required fee, and the cancellation terms. If a medical clearance or venue permission is needed, resolve it before setting a paid start date. You can take the proposal away and compare it; an expiring offer should not replace a clear description of the work.