Whey protein is a very popular choice, not only for individuals attempting to 'get big' or bulk up, but also for athletes who are doing supplementary training in the gym, as a part of a workout program. Whey protein is not really a supplement that will cause muscles to bulk up, but may aid in the muscle fibers to become stronger- more efficient, and help a little with actual enlargement-type growth known as hypertrophy. Protein is most commonly used as a supplement because what makes up protein is called amino-acids. There are both essential and non-essential, simply meaning, one's which the body cannot make and requires outside sources for it, and ones the body creates. These amino acids are what build, maintain and repair body, and specifically, muscle tissue. The idea here is that consuming protein during and immediately after training will improve the results of the workout program.
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