Narrows down your supplement search! Being an avid gym member, I'm on a constant search for the most effective supplements that will help me build the muscle I want. Searching for these in GNC, or another health store, can be like looking for a needle in a hay stack. This narrows down what you should take and which supplements are right for your particular routine. My mom also found it helpful, as she is on a slightly different exercise program, which entails a lot of aerobics. Very helpful for anyone seeking further fitnes benefits.