That caffeine buzz could make you blah

While caffeine has been reported to boost energy and endurance during long-distance activities such as 10-K runs, it may hinder your efforts on shorter, more intense workouts.

According to a recent study in the International Journal of Sport Nutrition and Exercise Metabolism, researchers gave either 6 milligrams of caffeine per kilogram of body weight (approximately three cups of strong coffee for a 130-pound woman) or a placebo to 17 men and women, then evaluated them on two one-minute maximum effort cycling tests. The group that received the actual caffeine had higher blood levels of lactic acid produced by overworked muscles; it also took them considerably longer than the uncaffeinated cyclers to reach "peak power" (pedaling all out).

If you're planning exercise like sprints or a few rounds of boxing, save the Coke for later. *On that note, Coca-Cola products will soon be labeling all of their beverages for caffeine content. Just another great move on behalf of corporate America which allows you smart fitness-minded consumers to make educated choices.