The Monkees (1966)

S02E06 I Was A 99 Pound Weakling

Heartbroken after his girlfriend Brenda leaves him for the muscular Bulk, Micky decides to transform his physique. He enrolls in a fitness regimen led by the dubious guru Shah-Ku (Monte Landis), who runs a deceptive fitness cult. Determined to win Brenda back, Micky embarks on a journey filled with challenges and self-discovery, hoping to prove that he can become more than just the scrawny guy he once was.