http://swissball.1000words.net List of exercises using the Swiss ball Mon, 03 Nov 2008 13:36:35 +0000 http://backend.userland.com/rss092 en The Back Extension exercise with the Swiss Ball activates the core muscles and stabilizer muscles of the spine. Start lying face down with the ball under the pelvis and ribs. Lift the torso until the pelvis almost stops touching the ball (without arching through the back). http://swissball.1000words.net/back-extension/