HOUSTON — How do you lift weights in microgravity?  Exercising
on a satellite floating 200 miles above the surface of the
planet presents some unique challenges. But working out is so
essential to counter the adverse effects of weightlessness on
the body that astronauts aboard the International Space Station
devote about 2 to 21/2 hours to exercise every day.  “I'm a
little less disciplined here on Earth,” said NASA astronaut Doug
Wheelock, whose first spacewalk was in 2007. “Up there, I just
stayed to my schedule because I was so distressed about being
able to get back to the Earth and not being able to walk. I lost
like 12 pounds and like 10 percent body fat. Of course I let
that go when I got back to Earth.”  Last month, NASA invited
reporters and social media experts to a daylong event at Johnson
Space Center to learn how astronauts stay fit during missions.
Astronaut Mike Hopkins, who will be heading to the space station
in September, has launched a new social media fitness program,
Train Like Mike. View