PREFACE bv Leonard Gross The temperature was above ninety. Our set score stood at 5-4. Suddenly， my opponent excused himself， walked from the tennis court and began to drink copiously at the water fountain. I walked over. \"Has the sun gotten to you?\" I said. \"You， of all people， drinking during exercise?\" \"Forget it，\" he replied. \";We know now that it s not just the salt you lose but the Vater you lose that makes you tired. Today you replace wateXr while exercising.\" My opponent was my physician. Twenty-five years ago， as a half-miler and captain of the UCLA track team， he never drank while exercising. The episode made me wonder whether there might be other rules we had all religiously followed that were no longer valid. I thought it might make an interesting maga- zine article， if true. A few phone calls led me to Dr. Lau- rence E. Morehouse， professor of exercise physiology at UCLA， founder and director of the universitv s Human Performance Laboratory. When I explained my quest， he laughed. \"You ve hit a gold mine，\" he said. \"Come on over.\" I found an unpretentious office and an unprepossess- ing man whom I took for fifty-two. I later learned he was sixty. In less than an hour， he demolished every notion I had harbored about fitness， conditioning and personal mainte- nance-including diet and weight loss. And he sizably en- larged my objective. 9
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