For example, we could rotate the ship circularly to create artificial gravity. In addition you could strap your self down to the floor of the ship, stomach first, and do push-ups. The strap will be similar to a belt with holes and hook. The belt will have holes on both sides with two hooks on the ground to strap yourself down to the floor. We won't have much waste because we will recycle it.
Humans generally produce five pounds of waste in a single day.
As I stated earlier we can change the waste into water feed it to the plants and then we catch the water vapor let off through the leaves. So waste is really a blessing in disguise. So we would have to eat the plants we grow in our green house. Also we might take some animals so we can eat them. Since the winds on Mars can gust at 80 mph we would make all the buildings aerodynamic so the wind just fly by it without harming the buildings, crew, and of course the plants.