How much gravity are you talking about? Like the moon? have you seen any guys up there moving fast? everything looks like its slowmotion

your muzzels would adapt to the new gravity and get weaker...if a person is out in space for a long periode and come back to earth that have higher gravity... this person will have problem just standing up straigth..
anyway with so little gravity, your hole body would be fucked up after a wile ;) imagen all your shit flying around hehe
that was all from the teacher (could explain everything better in norwegian, sorry...)
take care ;)