For years, researchers blamed muscle tension from tightening in the face, neck and the skin on top of the head.

VOA: special.2010.03.30

In addition, the newer suggestions say any exercise plan should include at least two days of muscle training.

VOA: special.2010.06.08

Swimming also presents less risk of muscle and joint injury because of the body's weightlessness in water.

VOA: special.2010.06.08

Doctors say those suffering muscle pain should stop all activity and rest in a cool place.

VOA: special.2010.07.27

The disease causes nerve problems in the hands and feet and muscle weakness.

VOA: special.2010.03.23

Muscle-strengthening activities help build and strengthen muscle groups in the body.

VOA: special.2011.06.28

Also on board is a new exercise machine, which is part of ongoing studies into the effects of long-term space flight on muscle and bone loss in astronauts.

VOA: standard.2010.04.05