Hold the resistance band in your right hand. Abduct your right arm at a 180 degree angle, flex your right arm at the elbow and drop the resistance band behind your back. Secure the resistance band with your left hand at the position of your lower back and tighten the resistance.
Concentric contraction: Breath out. Push your arm upwards to extend the arm at the elbow.
Eccentric contraction: Breath in. Lower the arm in a controlled manner. Repeat until the desired repetitions are complete.