America might not need yet another exercise machine. Treadmills, weights and resistance equipment already jam the health clubs. Yet Gravity machines have found a niche at the YMCA in this resort town.

SARATOGA SPRINGS, N.Y. — America might not need yet another exercise machine. Treadmills, weights and resistance equipment already jam the health clubs. Yet Gravity machines have found a niche at the ...

So many things about space and space travel are a mystery, but one thing definitely isn’t: the lack of gravity leads to serious muscle atrophy, bone loss and balance problems in astronauts. Even ...

Exercise is one of the lowest-tech activities around. You build up a sweat, make your body move, maybe build some muscles or drop some pounds — and technology has, at best, a role on the outside, in ...