Hamstring muscle size was determined before and after training via MRI. Thirty recreationally active men (age, 22.0±3.6 years; height, 180.4±7 cm; weight, 80.8±11.1 kg) provided written informed ...
The hamstrings consist of three muscles—called the semitendinosus, semimembranosus, and biceps femoris—that enable hip extension (moving your thigh backward) and knee flexion (bending your knee).