to increase strength for moving around in the cabin to keep from becoming overweight on a space mission to minimize the loss of muscle mass due to microgravity to ensure that bodily fluids do not tend to collect in the feet
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is the best reason for exercising on space flights?
Possibilities:
- to increase strength for moving around in the cabin
- to keep from becoming overweight on a space mission
- to minimize the loss of muscle mass due to microgravity
- to ensure that bodily fluids do not tend to collect in the feet

to minimize the loss of muscle mass due to microgravity