The knots you detect in your muscle, which may feel as small as a marble or even as large as a golf ball, are called ...

Aim: To examine the pre- and post-impact activation of five upper extremity muscles in the tennis volley across conditions of ball speed, ball type and side of the body. Methods: A repeated measures ...

If you work at a desk, you may spend a lot of time with your shoulders hunched without even realizing it. That's been my experience and I recently developed muscle knots in my shoulders.