1. Draw the moment arm for gravity on the shank creating torque around the knee joint (blue circle). 2. Draw the moment arm for gravity on the shank creating torque around the hip joint (orange circle). 3. Draw the moment arm for gravity on the whole leg creating torque around the hip joint (orange circle). 4. Draw the moment arm for biceps femoris long head pulling on the shank creating torque around the knee joint (blue circle). smb