At the cellular level, the mechanics of how muscle tissue repair occurs gets complicated. There are significant differences ...

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.

Physical fitness in kids refers to their ability to perform physical activity. Their fitness level is not only important for success in sports and athletics, but also for good health. Aerobic fitness ...

Children have a seemingly endless supply of energy. Channeling that energy into something positive can benefit kids’ minds and bodies. The American Academy of Pediatrics recommends various amounts of ...