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