Martial artists out to build their core strength should check out the NRG Ball System. Available in .Jf ^ 5-, 7- and 9-pound variations, it lends itself to medicine-ball workouts, barbell-style training and sport-specific applications. Each unit consists of a medicine ball and two 12-inch-long foam-covered handles. An instructional video, exercise guide and chart are included. The cost ranges from $79.95 to $99.95. (800) 321-6975, http://www.power-systems.com
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