The core routine requires two weekly ab sessions each week for 4-week. The length of the sessions are between 15-20 minutes. No excuses to not do them at least twice weekly. Workout 1: This sessions begins and ends with Rolling to warm-up your back and engage your core. There is a reason why this type of movement is in Pilates classes. Expect 6 exercises including a superset. Workout 2: This session has only 5 exercises but you have 7 total sets due to the superset of cable crunch and Russian weighted twists. Stay Strong Together, MICHAEL WOOD, CSCS Jefit