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