George Freen (George Formby) is a scrawny weakling barber's assistant. Inspired by the keep fit fad sweeping Britain George tries to get into shape - even more so after he falls in love with beautiful manicurist Joan Allen (Kay Walsh). However George has a rival for Joan's affections in muscle-bound middle-class Hector Kent (Guy Middleton). Joan seems to prefer Hector but plucky George exposes his rival as a shady character and challenges him to a boxing match.