Answer:
to counter the effects of zero gravity on their muscles and bones
Explanation:
Zero G's weaken the body, and muscular deterioration happens faster
It is a BC when its hot you dihyrate more than usual
-Stress
-PTSD mental disability (if they saw something disturbing)
-They could be injured (a telephone pole hit em, etc.
-They could not have sufficient nutrition sometimes (shortage of food)
-They would be in shortage in water so that is a big problem because they wouldn't be getting their daily amount of water intake (8 cups)