Curls on a Stability Ball. July 13, 2007 by Cathe Friedrich Cathe and Jai work their biceps on a stability ball using heavy dumbbells in Boot Camp. Categories: 4-Day Split Series, Behind The Scenes, BlogTags: 4 day split, boot camp, cathe, exercise dvd, Higher Intensity Step, kickbox, Lower Intensity Step Leave a Comment Related PostsWhy Women Lose Body Fat More Slowly Than MenApril 7, 2013Are Abdominal Crunches on a Stability Ball More Effective?December 24, 2017Cathe’s April 2020 Workout RotationApril 3, 2020