Designing the right fitness plan takes a bit of finesse. Sure you could go to the gym and just workout, but if you want to reach your goals, you need to create a plan that incorporates food, supplements, and exercise. The goals of a distance runner are far different from those of someone trying to build muscle mass. A cyclist has different needs than a bodybuilder and the training and nutrition needs to be geared toward that individual.
There are many ways for individuals to use protein powders. Powders are a quick and easy way to get in the necessary protein to build and repair muscles before and after workouts.