When you're on the goworking 40 hours or more a week, raising children, exercising intensely, and dealing with life's challengesit's easy to feel run down. A soda, an energy drink, or a cup of coffee may provide a temporary energy boost, but inevitably, it wears off quickly and makes you more exhausted than before. Bottom Line: You work hard, play hard, and take your workouts seriouslyyou need a source of lasting energy, something to relieve your daily exhaustion, increase your alertness, and give you a real boost of energy.