4. Quench with cool water.
A fresh-out-of-the-fridge water bottle may energize you for warm-weather exercise, finds a British study. Exercisers who drank refrigerated water (39°F) worked out about 25% longer than those who consumed the same amount of warmer water—and they said their exercise sessions felt easier too. Whether you’re inside or out, sipping chilled water both before and during exercise may help keep your body temperature down and your energy up for maximum calorie burn. (Sick of plain water? Sip these 25 slimming water recipes instead.)