Hello guys, Welcome to Africa's Largest Video Search Engine, and you are watching The Proper Technique for a Sit-Up: 3D Animation of Muscles in Motion. and this video is uploaded by Muscle and Motion at 2012-04-14T06:48:28-07:00. We are just promoting this video only for entertainment and educational purpose only. I hop you like our Video Search Engine. [bwljsCs1agM]