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 PostsStrength Training: Are You Stronger Than You Think You Are?November 13, 2016Is High or Low Rep Training Better for the Glute Development?August 11, 2019Is Obesity an Inflammatory Disease?December 8, 2013