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 PostsAbout the Music in the New VideosAugust 2, 2010Joint Friendly Training PremixesJuly 15, 2011Can Plant-Based, Low-Carbohydrate Diets Help You Lose Weight?February 18, 2024