The muscle burn and pump are a function of

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The muscle burn and pump are a function of high rep ranges, where a bodybuilder uses lower weight in order to fail using a much higher number of repetitions, which causes the muscles to fatigue in a far different way than with higher weight and lower reps. Because a muscle is capable of functioning for a greater period of time during a weight lifting set when using higher reps, there is a muscle burn and pump that begins during the latter segment of a high rep range, as the muscle  Action Fuel Pro approaches failure, but by virtue of using lower weight in order to sustain the muscle burn and pump rep range, muscle building is adversely impacted, and although the workout session may actually feel more intense due to the muscle burn and pump, the class of fatigue, which is focused upon endurance, is not the most effective for those who wish to accumulate the largest amount of muscle mass.  http://www.strongtesterone.com/is-action-fuel-pro-scam-or-fake/