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Consuming 200 to 400 milligrams of caffeine before training or sports competitions improves performance in endurance training and high-intensity interval training. Caffeine is legal in Olympic sports but restricted in sports regulated by the National Collegiate Athletic Association (NCAA). Spanish researchers from the University of Castilla-La Mancha in Toledo found that caffeine improved performance in the bench press and squat when taken in the morning but not the afternoon. The benefits of working out in the morning include enhanced training intensity. Caffeine is more effective for morning than afternoon workouts. Consuming caffeine supplements in the afternoon was less effective and produced more caffeine side effects.

References:

(Journal of Science and Medicine Sport, published online April 26, 2014)