Two Ab Workouts July 15, 2007 by Cathe Friedrich The 4 day Split series contains two Core routines, but the Ab workout on Kickbox seemed to be everyone’s favorite. Categories: 4-Day Split Series, Behind The Scenes, BlogTags: 4 day split, ab workout, boot camp, cathe, Higher Intensity Step, kickbox, Lower Intensity Step, workout dvd Leave a Comment Related PostsCan You Retrain Your Brain to Love Healthy Food?April 21, 2013Why Your BMR is Important for Weight LossJuly 26, 2010Is It Time to Ditch the Calcium Supplements?March 25, 2018