Most energy drinks are carbonated and full of sugar (or artificial sweeteners), which can cause gas, bloating, and fatigue. Not only are they not very good for you, they aren't very good at keeping you hydrated, which is key for a great workout.
Caffeine can help if you need a pre-workout boost, Batayneh says. "But think high-antioxidant green tea or black tea or even a nonfat latte (you get some protein in) which can provide an energy boost. Pair it with the right protein bar for the perfect balance."