GoFit"s Professional Stability Ball is a safe, durable ball with burst resistance to 2500lbs! This ball is perfect for weight training on the ball as well as users looking for extra performance for health club settings & other heavy-use applications. The kit includes a Core Performance DVD training session by Mark Verstegen, owner of Athletes" Performance & author of the books "Core Performance" and "Core Performance Essentials". Verstegen trains champions in many sports including Mia Hamm, Brett Favre, Curt Schilling, Phil Mickelson & many more. Also included is a two-way hand pump, an exercise booklet & ball plugs.