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because then they won't be sore when they come back to earth.

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Q: Why do astronauts have to exercise 2 hours a day?
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Related questions

How long do astronauts exercise in space?

They exercise for up to 2 hours each day, so that their bones and muscles don't become weak.


How much do astronauts exercise in the iss?

astronauts exercise everyday on the ISS for at least 2 hours to keep up bonce strenght and density.


how much can I exercise a day?

2 hours if you want


How can you get skinny faster?

you can exercise every day for 2 hours


How much exercise is needed a day?

At least 2 hours


How many hours a day should a 13 year old exercise?

1 to 2 hours a day is healthy.


How often does a sportmen exercise?

once or twice a day, every day for at least 2 hours


How much exercise should people get each day?

I think that people should get at least 2 to 3 hours of exercise every day :)


how many hours should i do exercise?

i would do at least 2 hrs. a day for good results


How many hours do astronauts spend exercising?

2 hours


How can you lose the fat on your arms and tummy?

Exercise 4 hours a day for 2 months


How do astronauts and cosmonauts combat the degenerative effects of microgravity experienced on the International Space Station?

excersising 2 hours a day