The energy and focus I felt from 1 scoop of C4 was a pleasant amount. Not too strong, but definietly enough to feel the difference. If I was feeling particularly tired one day, I could manage a second scoop and still not feel uncomfortable from too much caffeine. BeachBody On Demand It provided a nice clean, non-jittery feeling of focus too. In terms of endurance, I felt that C4 did a pretty good job of getting me through my workouts with a consistent amount of energy, and with a very mild - if any sort of crash afterwards.

One thing I did notice though is that it gave me a unusually dry mouth and made me feel really thirsty. I think it's likely because it doesn't contain any ingredients that help replenish electrolytes, which some other pre-workout supplements do.

I arrived at 8.5/10 for C4 Extreme because I found it very useful at improving my workouts. It was a nice change from some of the intense, high stimulant pre-workout options. A clean and comfortable energy and focus level, with energy sustained through my workouts. The price is pretty reasonable usually about the $30 per container, and finally because every flavor I've had thus far have been excellent, and mixed perfectly.