Since the release, Lorne Goldenberg's and Peter Twist's Strength Ball Training book has sold more then 60,000 copies, and the use of the stability ball - both commercially and individually - has risen significantly. This updated edition includes more then 120 progressive exervises, grouped by both function and muscle group. With the addition of the instructional DVD, this multimeida package is hte premier strength ball training title on the market. The DVD provides additional instruction for the most complex, technical exercises as well as a complete standard core training program.