what is a reasonable fee for a personal trainer session

this is an easier question to answer than you would think.
how much money do you need to make /month?
lets say you need to make 4000$ and you have 6 hours per day to train on 5 days per week. So you have 30 hours of training/week or 120 hrs of training / month. this works out to be a minimum of $33.33 per session to make your minimum per month. I charge $60/hr but I started out at $50 with package deals that put me as low as $25 for a 6 month package payed up front. Now I don’t offer deals my time is valuable to me and I have learned not to try to get every client I can but to pick the ones that I will work with best.

This is just an example and will depend a lot on what your bills are, if this is your sole source of income, how long your projections are of training full time, and your overhead.