Cathe, Lorraine and Robert March 31, 2008 by Cathe Friedrich Cathe, Lorraine and Robert doing a One Legged Sit-up with Ball during STS Ab Circuits. Categories: Ab Circuits, Behind The Scenes, Blog, STSTags: Ab Circuits, cathe, exercise dvd, fitness dvd, One Legged Sit-up with Ball, STS, workout dvd Leave a Comment Related PostsHow XTrain Exercises are SelectedOctober 12, 2012What is Meal Sequencing and Can It Help You Lose Body Fat?December 11, 2016STS Opening ScoreJune 2, 2008