S1·E35 Beefcake Tom

Flabby, out-of-shape Tom can't even chase Jerry anymore. He decides to enroll in a gym to get back his fighting physique. Jerry decides to tease him and gives him his own brand of exercise regime. At the end, Tom gains muscles and Jerry decides that they should train some more. However, due to Jerry's excessiveness, Tom uses him as a muscle pumper.