Weak areas of the body will show their deficits once there comes a task that the body is not used to—like those last few miles of a marathon. Hamstring injuries and pain are one of the most common complaints among distance runners. This group of muscles plays a vital role in the running cycle, yet many athletes do not prioritize hamstring strength during training. Read on to learn why this muscle group is so vital to the running cycle and how you can keep yours healthy.