HOW: Get set up standing with your hand resting behind your back in a comfortable position. Begin the exercise by performing a hip hinge followed by standing tall and reaching out and back behind you with the other arm to stretch your pecs. Repeat
FEEL: This should feel like a shoulder and pec stretch, likely in the front and all around your shoulder.
COMPENSATION: If you can tolerate it, try to keep your shoulder blade back when you stand tall on the side you have your hand behind your back. Otherwise, just focus on the hip hinge and stretching with your other arm.