Upgrade your Muscle head with tons of fun skins! Collect a huge range of wacky characters as you progress through levels, from traditional strong men to gym bros, athletes, wrestlers, superheroes, and more. Customize your musculature to achieve maximum strength! Collect your own color dumbbell and Build up your body! Muscle Up, 3D adventure, customize muscles, character skins, fitness game, build body, strength, racing, adventure, characters, customization