This book intend to provide EBP Flexibility training on hamstrings athletes. The Hamstring muscles are found to be the most prevalent for the tightness in the body. Tightness of these muscles produces decrease range of motion and reduced flexibility of the pelvis, hip and knee joints. Muscle stiffness of the lower extremities and the consequential decrease in joint flexibility are considered to be major etiological factors in musculoskeletal injuries. Muscle tightness is a limiting factor for optimal physical performance including daily activities and an important intrinsic factor for sports injuries. The investigator concluded that the Muscle Energy Technique is more effective than Eccentric training in improvement of Hamstring flexibility in healthy athletes.