After a really intense, sweaty workout, I want nothing more than to quench my thirst by downing some cold water; it cools me down and rehydrates my body. It looks like post-workout isn't the only time it's good to drink cold water. A British study shows that "a fresh-out-of-the-fridge water bottle may energize you for hot-weather exercise." Get this — those who drank brisk water worked out 25 percent longer than those who drank warmer water, and they also claimed that the workouts felt easier.
I like to place a bottle of water in the fridge the night before, so I can sip some chilled water before and during my workout the next day. I find it really does prevent me from feeling hot and tired, and helps increase my energy levels. And I must add: yay for warm weather!