Single leg V-Sit March 30, 2008 by Cathe Friedrich Cathe doing a V-Sit during STS Ab Circuits. Categories: Ab Circuits, Behind The Scenes, Blog, STSTags: Ab Circuits, cathe, exercise dvd, fitness dvd, STS, V-Sit, workout dvd Leave a Comment Related PostsWhat Are the Short and Long-Term Effects of Exercise on the Immune System?March 29, 2020Concentration Curls Drop SetsMarch 19, 2008Greg with a heavy dumbbell.March 17, 2008