When holding out your arm to train the external rotator muscles of the shoulder is not possible, do this!A slight offloading technique using a sliding object on smooth surface prevents the stronger upper back muscles and neck muscles from taking over.This Rear Shoulder stabilizer & offloaded reverse Nordics hip strengthener with resistance bands superset strong body foundation session is a must for you to try!Be careful when you're doing the reverse Nordics. Stabilizing your hips and keeping your core engaged and stiff is important. Be careful and go slow, build up range of motion over time.You've seen me do that and I am still not able to go full range of motion yet!The eccentric loading for my rectus femoris, one of the quadriceps muscles and the only one that runs over both knee and hip of the four, has transformed how my body feels!It resolved that chronic stiffness I've been feeling for a couple of years! I didn't need stretching or psoas training, I needed stronger thighs! Always check your resistance bands for tears before you use it.