What does trotting without stirrups work?

what muscles does just doing a sitting trot without stirrups work? does it work different muscles than trotting with stirrups? if i sit trot without stirrups for long enough will i be able to eventually posting trot without stirrups? what are some things i can do at home to be able to post trot without... show more what muscles does just doing a sitting trot without stirrups work? does it work different muscles than trotting with stirrups? if i sit trot without stirrups for long enough will i be able to eventually posting trot without stirrups? what are some things i can do at home to be able to post trot without stirrups?
thanx in advance :)
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