"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Theragun may have put massage guns into the hands of people who aren't athletes or PT pros, but Hyperice ...

Muscle knots are hard, sensitive areas of muscles that tighten and contract even when the muscle is at rest. These tense muscle fibers can cause pain in other parts of the body when touched. Muscle ...

Human movement is reciprocal in nature: Opposing muscle groups must coordinate for proper movement. Muscle length and strength between opposing muscle groups need to be in balance for normal movement ...