Stretching is important before and after exercise to prepare and recover muscles. When muscles are stretched, they are extended to a resistance point which helps muscles and joints. Stretching improves flexibility, prevents injuries, and promotes strength. It also improves running form, performance, coordination and reduces soreness. The document then provides instructions and photos for how to properly perform different stretches, like hamstring stretches while lying down, forward bends while seated, and quad stretches while standing. Stretches should be held for 10-30 seconds until a mild discomfort is felt but not pain.