Protein supplements should be part of sports nutrition, without these said sports nutrition supplements, athletes would not be the way they are at present. However, contrary to what most people think, diets jam packed with protein do not necessarily build up muscle strength.
If you are one of those ill-witted who perceive athletes as gods who don’t need to stop to take in air, or to relax when there is need for relaxation, then perhaps it would be much of a disappointment to you to find out that athletes are not so different from those who are not athletes for they also make use of supplements to get them going.
It is part of their diet to take in supplements to have an enhancement of their endurance, and also to increase or, if not increase, maintain the appropriate muscle mass to be able to improve size and strength.