Tendon injuries are a common consequence of either sports or daily routine activity. Most people will suffer at least one tendon injury in his or her lifetime. It is therefore prudent to understand the different ways to load tendon and the ways in which the muscle-tendon-bone unit responds to these stresses. By maximizing tendon training and rehabilitation, one can maximize the stresses (eccentric) a tendon will withstand. This article provides an explanation of these principles.