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 PostsTentative Agenda for DaytonaSeptember 2, 2009STS Disc #19 Meso #2 Week #3November 15, 2008Four of the Safest Lunges for Arthritic KneesMarch 3, 2024