Muscles glisten under the harsh gym lights as a solo jock, unseen but felt, goes through his paces. Nude, his body ripples with every push-up and ab crunch, sweat dripping onto the hardwood floor. His limp cock sways between his legs, growing plump as he feels the burn. It twitches, thickening, as he grinds out reps, his ass clenching, his dick now a throbbing, veined monster.