Group Shot of Concentration Curls July 13, 2007 by Cathe Friedrich A group shot of concentration curls in Boot camp. Categories: 4-Day Split Series, Behind The Scenes, BlogTags: 4 day split, boot camp, cathe, fitness dvds, Higher Intensity Step, kickbox, Lower Intensity Step Leave a Comment Related PostsAre There Downsides to Wearing a Fitness Tracker?March 17, 2019Pain in the Buttocks? It Could Be Piriformis SyndromeFebruary 17, 2019Does Foam Rolling Reduce Delayed Onset Muscle Soreness?August 20, 2017