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