Place an inflatable mini ball (or small cushion, large paper towel roll, etc) under your lower back. In this series, it both supports the spine and adds a challenge while you focus on pressing the lumbar spine into the ball, maintaining that deep c-curve to really fire up the core Use 1-5 pound weights to work the arms ⚫ perform each move for the required reps per side ⚫ complete 3 rounds of the series