Strength training is an especially good way to build or keep your muscle mass.

But building strength and muscle mass in the arms isn't just for show.

By 80, you could have 40 percent loss of muscle mass.

Any young quarterback with a name to know has turned his baby fat into muscle mass.

Protein can help you prevent the loss of muscle mass.

Now a study has found that weight training can help these patients maintain or increase their muscle mass.

Human growth hormone is also thought to increase muscle mass.

I think she's a role model for normal looking women who don't feel they need to be stick thin with no muscle mass.

You have lost any muscle mass in the wrist, hand, or fingers.

It is used by thousands of professional, college and high school athletes to increase muscle mass.