This is very simply a shoulder press from the bottom of a back squat. In the bottom of the back squat, with the bar racked on the upper back and the hands in a snatch grip, press the bar straight overhead, reaching toward the ceiling. Keep the shoulders active, chest up, glutes and hamstrings engaged, and a good lumbar curve in the back. Start with a dowel and add weight in small increments. This movement both requires and develops flexibility and comfort in the bottom of the squat...