CaffeinePerformance/Endurance EnhancerThe tests show that ingesting 330 mg (or 5 mg per kilogram of body weight) 30 minutes to an hour before workouts results in longer endurance, faster times, less exertion, less fatigue, and more rapid recovery -- up to 30 percent better in each category. The most effective caffeine, though, is in tablet form, not in coffee, because the 100-plus other compounds in coffee probably block some of the effect of caffeine.
Fat BurnerCaffeine, which speeds metabolism, is the most-active ingredient in many "diet pills."
Caf breaks down fat, freeing fatty acids which are immediately burned. Conversion of fat to energy is about 30 percent more efficient when caffeine is consumed prior to exercise. The break-down, and the burning, occur only when you're working out!
While the fat is being burned, the glycogen, glucose, and amino acids (blood sugars) are being reserved -- so blood sugar levels remain higher for longer. Low blood sugar = hunger; high glucose staves starving. This is why coffee is popular among students and think-tankers. The brain functions exclusively on glucose, and higher blood sugar levels facilitate thinking.
So try and take 330 mg (or 5 mg per kilogram of body weight) 30 minutes to an hour before your workout. If thats too much build up to it. If anything I usually just grab a coffee before I work out. It gives me a little boost!