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Given my absolute druthers, I would certainly like to see that every part of my body is used for spare parts for science.

Researchers can measure what kind of angles your legs take up during the day when they're just trailing around behind you in weightless conditions, and what kind of impacts you feel during your exercise. They're going to compare that with what we do on the ground.

I think for my bones and my size, I better stay with my 60 kilo.

I have been struck again and again by how important measurement is to improving the human condition.

A lot of the data we collect is stuff that has to be analyzed on the ground. For instance, we can't see, you know, bone loss. Our cells, you know, that's something that we'll have to notice with imaging technology when I get back.

There's a lot of interest from the medical community on how things develop in microgravity, and the hope, later, that is expected to apply to what the changes are in humans as well.

Coming from an athletic background, the scientific aspect is a really big part of understanding beauty and how the body works.

I think what's important is to give space to the range of human experience.

As I've gotten older, I've come to realize how important it is to vary your workouts.

The workouts have positively impacted the astronauts' bones and muscles, and they are coming back in really good shape. But some are losing bone and muscle but not as much as we saw in the early days.