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Better fitness books have clear illustrations and plain explanations of proper exercise routines. That’s the case with “Radu’s Simply Fit” (Cader Books, $18.95), from which this pretzel stretch, a move to build flexibility and cool down from a workout, is taken. It requires a straight back and a gentle, full twist of the upper bod, and is among the many moves offered by the personal trainer who counts trim celebrities Cindy Crawford and John Kennedy Jr. among his acolytes.
