If you are still only 14 years old, I strongly recommend that you don't develop caffeine dependency. Caffeine has many chemical properties that work with your motor neurons, adrenal system, and blood pressure, etc, and it is addictive. The effect of caffeine is not necessary stable, so it may help you perform your coda, but also can wear you out and start shaking your hands. Probably, better practice routines to perform your coda well without caffeine is more ideal in the long term!
I strongly recommend that you don't develop caffeine dependency. Caffeine has many chemical properties that work with your motor neurons, adrenal system, and blood pressure, etc, and it is addictive.
i find heroin to be very effective but there are some drawbacks...
It is said to quite moreish. lol.Anyway - 'addict' and 'dependancy' are such ugly words.Think of yourself as a chocoholic, just with drugs.