Stretching seems to be a physical activity in which a particular muscle or tendon is intentionally flexed or extended in order to increase the muscle's felt elasticity and achieve relaxed muscle tone.
Stretching maintains the muscles relaxed, heavy, and stable, which is essential for maintaining joint range of motion. Muscles shorten and become rigid without it. When you activate the muscles, they become sluggish and incapable of completely extending. As a result, you are more likely to experience joint pain, strains, and muscle injury.