A strain (pull) is a tear in the muscle or tendon. It can be a tiny tear or a large tear (rupture). Intense stretching, repetitive movements, heavy lifting, and abrupt or explosive movements can cause strains, Sports such as football, basketball, track, golf and tennis can cause muscle strains. The hamstrings, quads, calves, and the back are more susceptible to strain than other muscles. It is important to learn how to warm-up properly. A warmed-up, nonfatigued muscle is