Stand up straight with a resistance band secured firmly under the ball of the foot on the same side as the arm you are about to exercise.
Hold the other end in your hand and gather the beginning of some tension.
Step forward on your other leg, keeping your weight on the back leg.
Hold your hand in front of your shoulder with your elbow bent.
Keeping your body straight, push your hand directly up into the air, straightening your elbow.
Simultaneously move your weight forward onto your front foot, reaching as high as you can.
Control the movement as you return to the starting position and repeat.