What aided Jimmy Cagney's ring performance (besides the above mentioned amateur boxing experience he held) was that his opponent 'Al West' was played by stuntman extraordinaire Harvey Parry, who himself was an AUU Boxing Champion. During the silent era Parry stunt doubled for almost every Hollywood star (except Buster Keaton ) includingDouglas Fairbanks. Because the studio always claimed Fairbanks did his own stunts, Harvey Parry 'kept quiet' on the issue for over forty years.
You could stand a cold drink after that one, couldn't you?
Jimmy sends to his manager a photo of himself, Peggy and her son who is dressed as a small Indian. In the next scene, returning to the desert health farm, shows the Cagney, Nixon and Moore characters all wearing the same clothes of the previous photo.