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