Resistance Training Beats Brittle Bones

People with osteoporosis share something in common with astronauts: Both require weight-bearing exercise to guard against bone loss. For those in space, the problem ends once they get back to earth and regain the pull of gravity upon their bones. But for millions of Americans whose bones are already weakened from osteoporosis, the pull of gravity is not enough to slow or reverse the loss of bone mass. They need a long-term program of resistance…