Sit on the floor with your legs and arm fully extended in front of you with a forward lean while holding the handle with an inward facing palm at shoulder-level.
Exhale and drive your elbow and shoulder blade back while simultaneously twisting your torso.
Continue this motion until your elbow passes your torso.
Inhale and allow your torso to rotate in the opposite direction, extending your arm to return to the starting position.
After all reps are completed, switch sides and repeat the movement. 10 reps prescribed means you should perform 10 reps on each side (20 total).