Abs need work. They require different exercises that place a different load on each of the four abdominal muscle groups. Core Twister lives up to its name. It works the core. It will push your abs. It will make you functionally more powerful by allowing the power transfer from the lower body tot he upper one and vice versa to happen with as little loss of energy as possible. To do all that, you need to do the Core Twister workout. With EC.
Extra Credit: Keep the plank throughout.