Caffeine Intake For Performance
Numerous studies have shown that by stimulating the central nervous system, pre-exercise caffeine can help combat fatigue during endurance activities such as swimming, cycling and running, making it an ideal sports supplement for endurance. The obvious question of course is how much caffeine should you take to gain maximum performance benefits?

You could just use a "sledgehammer approach" and take very high doses to make sure you're getting plenty to boost performance. The problem however is that caffeine is not without its side effects (e.g. rapid or irregular heartbeats, anxiety, insomnia, to name but a few) so using the minimum required dose, yet one that still boosts performance is a far better strategy!