Hamstring strain injuries most commonly affect the biceps femoris long head, particularly near the myotendinous junction. While strengthening exercises are a cornerstone of injury prevention, the role of the aponeurosis (the connective tissue within and around the muscle) has received much less attention. A recent MRI study compared 10 weeks of eccentric hamstring training (on a isokinetic dynamometer) with time-matched static stretching (maximal knee extension, for 3x ~68 se