erexercise

An accidental male arousal caused by the friction of vigorous activity

Steve wasn't ogling the girls at the gym, he just erexercises when he uses the spin machine.

Erexercise

Exercising with an erection.

He was running on the treadmill and spotted a bouncing pair of boobies leaving him no choice but to Erexercise until his throbbing member cooled down.