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 PostsYou Will Love the Ab Workouts!August 28, 20065 of the Healthiest Fall SuperfoodsSeptember 16, 2012Cathe Works Her Triceps in Xtrain Bi’s and Tri’sOctober 13, 2012