In space and on mars, there is not enough gravity for people to need to use their muscles and bones, so they just shrink and weaken. We don't want that to happen, so we made these materials extra heavy (100 lbs on Earth, 38 lbs on Mars) so Mars visitors will use and keep all of their muscle and bone material.
Respiratory and Circulatory
This product helps with the respiratory and circulatory systems by forcing people to breathe harder and make their heart beat faster to get more oxygen to the muscles faster and so they will get used more and work better.
Nervous
This product was specifically designed to be fun, not repetitive, and usable to make people happy and keep good mental health.
N.A.S.A should invest in our product because it helps keep space travelers healthy in a way that they would enjoy doing.