Over 400 skeletal muscles keep a healthy person in motion through contraction and relaxation. About 40 percent of male body mass and 35 percent of female body mass consist of muscles. However, this proportion can be significantly reduced if the muscles are not sufficiently exercised. Specially designed training equipment for fitness sports provides variable resistance against the exercise movements, effectively helping to strengthen muscles as well as stimulate and enhance circulation and metabolism. The variety of strength training equipment is therefore not just a passing trend. Different muscle groups are specifically targeted, allowing for a balanced load on the entire body. Typical devices for over 30 exercise forms are described here, along with endurance equipment that enables movements like cycling even in limited spaces.