A lot is going on in this movement. Get into the position in phases. Lay flat, put the small foam roll between your knees, put the band around your feet. Then, extend the arms and band overhead, fully extending your arms. At that point press the small of your back into the floor while peeling your shoulder blades up and off of the floor, this will create the “hollow rock” position in your core, hold that strong while also squeezing on the foam roll between your legs. Make sure you are breathing deeply and exhaling strong throughout the hold.