Stand in machine with lower pads behind lower legs, upper pads in front of thighs, and lever fulcrum between knees. Bend over, placing forearms on pads, and grasp handles. Stand with body weight shifted on foot of resting leg and raise foot of exercising leg slightly off of floor or platform.
Raise lever up by bending knee as high as possible. Return lever until knee is straight. Repeat. Continue with opposite leg.
The bent-over posture decreases active insufficiency of three of four heads of hamstring at completion of knee flexion. Dorsal flexion of ankle reduces active insufficiency of Gastrocnemius allowing it to assist in knee flexion. This exercise is variation of Standing Leg Curl but is similar biomechanically to Kneeling Leg Curl.
Antagonist Stabilizers (see comment)