Caffeine is something we take for granted, we look at it solely as a thing to wake us up on the morning, or function normally in society. There are some definite perks to caffeine in your life, from diet to physical function.
Caffeine is a stimulant. One thing that it does is speeds up the impulse (action potential) of your nervous system. This in turn speeds up your heart rate, forces additional signals to your muscles (which could be a factor in jumping higher or lifting heavier....if that's something you desire). So, you can see an improvement in performance and thus body composition when you consume caffeine.
By seeing an increase in performance, you can then improve your body composition. So in the act of drinking your morning coffee, you may be able to actually see yourself lose some weight. Obviously there's more to it than that, but in the end it something to consider.
Now this effect has not been shown on everyone and too much caffeine may have the opposite effects, which would rapidly speed up your heart rate in which case you can't handle a workout without feeling like your heart will explode. So, a cup or so before a workout may be beneficial, but a cup of coffee, an energy drink, and a few other things may not be most advisable.
So pick up that cup of coffee and enjoy, you may be doing your body a huge favor later.
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