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 PostsHarnessing Nature’s Bounty: 5 Benefits of Eating SeasonallyDecember 25, 20225 Hormones That Impact Strength TrainingNovember 29, 20156 Healthier Alternatives to MayonnaiseJuly 15, 2012