Keep Fit

Keep Fit is a 1937 British comedy film directed by Anthony Kimmins and starring George Formby, Kay Walsh and Guy Middleton. Formby was at his British top box-office peak when this comedy was made.
Synopsis.
George Formby again plays his working class underdog, gormless, gullible, indefatigable and triumphant hero. A weakling, Formby's character overcomes obstacles to beat a corrupt rival in the boxing ring. He plays a scrawny barber's assistant who, in response to the keep fit fad sweeping through Britain at the time, dreams of a better physique, and sings of it in the catchy "Biceps, Muscle and Brawn". He falls in love with a beautiful manicurist, and competes for her affections with a muscle bound thug. The manicurist is more attracted to the brute until the barber can prove that he is a crook, and defeat him in the boxing ring.
Critical reception.
According to Sky Movies "it's a bouncy, confidently made comedy that's fun throughout and pretty hilarious in its boxing-ring conclusion".