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 PostsBest Bodyweight Exercises for a Strong Core: The Science Behind Your Six-PackSeptember 22, 2024Do You Need More Dietary Protein to Build Muscle as You Age?March 20, 2016Recharging Your Mind: 6 Mental Health Benefits of a Day of SolitudeMarch 26, 2023