I used to train people on the side all the time and i charged $40 per hour. I trained quite a few hot women over the years who offered sex as payment after a few weeks of training and i always turned it down because it NEVER EVER works out in a good way, it will always backfire.
One thing to keep in mind, if all these women you plan on training go to the same gym and you end up banging a few of them it's going to be public knowledge. Older women love to brag about getting banged by a young stud and soon you will be changing gyms because your image will be tainted. I personally wouldn't have sex with a client, but i have also never used the gym as a place to pick up pussy to begin with. It's a business, not a pleasure center.
If all you care about is pussy go for it, but if you are actually trying to make some money keep your dick in your pants and pick up pussy outside the gym. Someone as self proclaimed as you shouldn't even have this problem i would think...
