If you exercise, do you really need to use bodybuilding supplements? It’s true that exercise is very important when it comes to building muscles, but it’s not enough to get you the muscles you want. If you want muscle mass and you want a significant amount of it, your eating has to support doing that. You can’t build muscles if you don’t have the proper raw materials to do so, so if you want to get the muscles you envision, you’ll need to adjust those raw materials and then do the exercises to shape up, instead of the other way around.