From The Sauna To The Gym
Sometimes your mind is elsewhere, and you absentmindedly start doing questionable things. This guy probably walked out of the sauna or a locker room and, without changing into appropriate clothes, started working out in a flimsy towel! When a lot of movement is involved, that clothing will not be able to protect his dignity.
He also seems to be deep in thought while just standing still on the treadmill. It really makes you wonder as to what is going on in that mind that made him disassociate from his surroundings?