It's nice and simple. This mod will make your stats increase on a much faster rate. When you install the mod on your first step your health bar will increase to it's max size and you will have max stamina. On every shot of a gun your level will increase and you will only need to shoot a target 10 times to reach the next level. You will also never get fat or need to eat (this hasn't been tested).
Download from GTA GARAGE