Greg performs a Concentration Curl during STS March 19, 2008 by Cathe Friedrich Greg performs a Concentration Curl during STS Meso #2 – Back & Biceps. Categories: Behind The Scenes, Blog, STS, STS Mesocycle #2Tags: cathe, concentration curl, exercise dvd, exercise dvds, fitness dvd, fitness dvds, hypertrophy, mesocycle 2, STS, workout dvd, workout dvds Leave a Comment Related PostsWaist-to-Hip Ratio Says Something About Your Health Risks: How to Measure ItNovember 13, 2022Seated Overhead PressApril 13, 2008Exercise and Vasomotor Symptoms: Do Workouts Reduce Hot Flashes?January 17, 2021