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Hello, this is Isa Astronaut Samantha Cristoforetti on board of the International Space Station.

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And I have just completed my workout for today on this very special bike.

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As you can see, it does not have a seat.

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In weightlessness, you cannot walk and you cannot sit, and we don't need to.

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We can just put our feet or our shoes in the pedals and start pedaling away.

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This is not the only piece of equipment we have on ISS.

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We also have a treadmill.

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On it, we can run as though we were on Earth.

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We need a special harness to keep us put, otherwise we would float away at the first

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step.

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Fun fact, on ISS, we can also do weightlifting in weightlessness.

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It sounds very easy, but it's a pretty good workout.

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We have a special machine dedicated to that that really gives us some serious loads to

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work out.

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It's very important up here to work out every day a couple of hours.

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Of course, exercise is important on Earth as well.

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For us up here, it's important because we are weightless all day, and so if we didn't

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work out, exercise puts some loads on our body.

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We would quickly lose muscle mass, strength, and also bone density, so very, very important.

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Just like for you on Earth.

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So what kind of exercise have you completed on Earth today?

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NASA Jet Propulsion Laboratory, California Institute of Technology