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 PostsWhat Are Stabilization Exercises and Why Do You Need Them?October 16, 2016Exercise Doesn’t Just Improve Lifespan – It Enhances Health SpanDecember 24, 2017Introducing The Cathe Forums iPhone AppSeptember 1, 2010