Good morning! I have had multiple requests for more core options to keep the core challenge going indefinitely. I will work on introducing more challenging abdominal series to keep you progressing! Here is an excellent full length video that has an advanced ab flow at the beginning. The first 13 minutes of this video is ALL CORE. It is very similar to some of the core challenge videos
It is located on the INTERMEDIATE SERIES CHANNEL, Intermediate, Week 5 Workout #1. Enjoy!