Goofy Gymnastics.

Inspired by a magazine ad, Goofy sends for a mail order body building course. First is weight lifting; after Goofy finally gets the weights up, a fly lands and sends him crashing through several floors in the apartment building. Chinups: the bar itself goes up and down. Then a rubber-band stretch device, which Goofy quickly tangles up in, sending him crashing through the building and several other pieces of equipment.