The Importance Of Rest: If you lift weights, you need even more rest -- at least 48 hours between workouts. Don't lift weights more than three times per week, experts say.

Water: You don't need sports drinks, unless you do strenuous aerobic exercise for at least 60 minutes. These beverages contain sugar or fruit juice and electrolytes (mainly sodium and potassium). But for most of us, ordinary water is fine.

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