Optimum fitness dumbbell. The dumbbell is the most popular fitness accessory. It is ideal for every type of athlete because it allows you to perform many different exercises that will improve your muscular system. It is mainly used in fitness exercises to strengthen parts of the upper body such as the chest, back, shoulders, arms, as well as the abs and legs. The ergonomic handle helps to prevent slipping from the hand, while its soft rubber coating protects your floor and does not make noise every time it comes into contact with it. Its hexagonal shape prevents rolling and keeps it stable at the spot where you place it.