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