Bind a Loop Band to the top of the door with the specific Utility Strap, hang the to the strap (without knotting). In lunge poition grab both the ends of the band.
Bring to your torso your arm corresponding your knee resting on the floor. at the end of the set, switch side. During the starting phase of the exercise the arm is outstretched, while is lightly bent during the final phase.
8 per each side (better not to alternate) x 3 sets.
Bending your arm too much while performing.