Revvies are a great way to add a pop of caffeine to your run without any unnecessary liquid, calories, or fuss. Simply lay a Revvies strip on your tongue and allow 20-30 seconds to dissolve. Each strip provides you with 40 mg of caffeine, or about the equivalent of half a cup of coffee. The strips are sugar free, gluten free, vegetarian, and contain less than a calorie each, creating a simple solution to boost your next training session.