In LifeFit you'll find an easy-to-follow program for lengthening and improving the quality of your life. Dr. Ralph Paffenbarger presents this prescription based on more than three decades of studying the relations between physical activity， health， and fitness. More than an exercise guide， LifeFit is a clear and effective tool for making meaningful lifestyle decisions to benefit your long-term fitness. Paffenbarger's research shows it's never too late to reap the rewards of exercise.
LifeFit is sure to give you a new perspective on (and timeline for) aging. | 
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