Its a waste of time if you prefer to be small, and not have large amounts of muscle.
(like me)
why the christ would you WANT to be small and weak?
I have a friend who does push ups every night+morning and his chest and arms are huge
Why would you think it doesn't work?!
calisthenics are fine to do regularly, but he'll plateau in no time if he hasn't already
if he was to bench press morning and night (and progressively load it, not any of this low weight high rep stuff) it'd absolutely forget him up