D E F I N E: body & mind isn't your typical aerobics studio. The tools of the trade consist of a rubber ball, like the kind used in middle school dodge ball, a cushy mat and a ballet bar. The combination gives you long and lean muscles without joint impact. We took the G.U.M.B.O. Fitness personal trainers to the River Oaks Shopping Center location to get their take on the workout. Monthly memberships are available at three Houston locations and pay-as-you-go classes begin at $20.