Cathe doing a Concentration Dumbbell Curl. February 4, 2008 by Cathe Friedrich Cathe performs a concentration curl during an STS rehearsal earlier this week. Categories: Behind The Scenes, Blog, Rehearsals, STSTags: cathe, concentration curl, exercise dvds, fitness dvds, rehearsal, STS, weightlifting dvd, workout dvds Leave a Comment Related PostsHigh Reps – AmandaSeptember 6, 2010The History of KetchupMay 28, 2012Fast-Twitch Muscles: How They Work and Why They MatterApril 16, 2023