muscles
legs
brains
hands
their sense of balance doesn’t change
their sense of balance gets better
their sense of balance gets worse
microgravity
regular gravity
zero gravity
sleeping sickness
food poisoning
migraines
motion sickness
eating
walking
talking
interacting
stomach
lungs
torso and head
legs and arms
nothing, it stays the same
it speeds up
it swells with fluid before shrinking
it slows down