When I was in college, I first lived in a dorm. The dorm had a small gym on the lower floor you could check out for an hour at a time. It had a workout station with four sides that let you do a variety of weight lifting exercises, but no free weights. There was also a big mat for aerobic workouts.
The best time for me to workout was in the middle of the day, so I would often workout alone. After a while, I figured since I was alone, I could workout in the nude, which I did.
The entire room was surrounded by mirrors and it wasn't long before I noticed myself getting fitter. Seeing myself nude in the mirrors was a bit of a turn on.
One day while I was cooling down from my workout out I began touching myself. Touching lead to fondling which lead to stroking. It wasn't long before I was on the verge of an orgasm. I couldn't help myself. I lay there on the mat and shot my load across my stomach. It felt so great! What a release! Luckily I brought a towel with me. I made this a regular part of my workouts. After pumping iron, I would pump myself to orgasm.