A fat man sees a sign on a door: lose 1 pound for $1…

He puts a dollar in the slot and enters. There is a jogging track with a beautiful naked woman wearing jogging shoes. "Better start running" she says, beckoning him. Excited, he chases her around the track for an hour. Finally he catches her, she… ahem… rewards him… then he steps on the scale. He lost 1 pound!

As he leaves he sees a new sign next door. "Lose 2 pounds for $2". He pays, enters. This time there are two gorgeous naked women in running shoes. They say "Better start running." He does, chasing them around the track. Two hours later he catches them. He is doubly… rewarded. On his way out the scale shows he lost 2 pounds!

The man leaves. Sure enough, next door there is a final sign: "Lose 3 pounds for $3." By now the fat man is exhausted and can barely walk… but he cannot resist. He pays and enters. The door slams shut behind him and locks.

Alone on the running track is a 6'4" muscular male body builder, naked except for running shoes. The naked athlete points down at his enormous erection, smiles at the fat man and says…

"Better start running."