Editor’s note: Dana Santas, known as the “Mobility Maker,” is a certified strength and conditioning specialist and mind-body coach in professional sports, and is the author of the book “Practical ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

You’ve tried everything. Stretching routines, massage therapy, foam rolling, hot baths, and still, that nagging tightness in your muscles persists. Before you book another bodywork session or invest ...