Two Ab Workouts (Last Updated On: July 4, 2009) The 4 day Split series contains two Core routines, but the Ab workout on Kickbox seemed to be everyone’s favorite. Post navigation Core WorkKickbox Stretch Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.