Choke a band around the pull up bar. Grabs the sides of the band and pull it down far enough so you can you can put your knee in it. Push your knee down and keep it there. DO NOT let the band slide off your knee. Do your pull ups. When doing your pull ups, retract and depress your shoulder blades. Start the movement by pulling your shoulders down your back as hard as you can.
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Use a band that allows you to get at least 5 reps