Death and taxes. According to our ever-insightful forefather Benjamin Franklin, these are life's only guarantees, and while I respect a man who can rock a good pair of bifocals, I think ol' Ben left an important certainty off the list -- a threat that comes each and every year and instills terror in the hearts of millions of Americans, causing them to scream, sweat, and run (literally) for their lives.

I'm talking about swimsuit season! Every spring, as the summer months loom, America's parks and gyms are flooded with masses of sweaty bodies, all with a single motivation in mind: Look good enough by Memorial Day to feel comfortable getting half-naked in front of complete strangers.

And all this exercise is certainly a good thing for our country's health: A recent American Journal of Preventive Medicine study predicted that 42 percent (!) of Americans will be obese by the year 2030, and research shows that physical activity is one of the best ways to keep the pounds at bay.

So with fitness in the air, now is the perfect time to dig up the facts on the best and worst drinks for your workout. There are tons of sports beverages on the market promising to help you lose weight, run faster, and jump higher, but many of these claims are nothing but bogus marketing ploys. And not only are some of those bottles and cans filled with empty promises, but they're also brimming with empty calories that could undermine your hard-earned workout gains. Read on for five exercise-enhancing beverages that can help quench your thirst, boost your performance, and support you on your journey to swimsuit six-pack-dom.

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