Holding two weights to exercise with is very practical. It is simple, flexible and almost without limits. You can practice moves that work different parts of your body all along the spectrum from those you do standing up to ones lying down. So the dumbbells are specially adapted to stretching exercises. Carrying the dumbbells in one hand and changing the position of the weights makes arm movements less likely to cause injury. This is important because when we lift weights our arms work continually that day, producing an invigorating effect. It is well established from the exercise sciences: the heavier the weight one lifts, the bigger one's muscles grow. In addition to muscle strength and endurance, dumbbells can help strengthen other body areas. They also make it easier for people to move their own weights when lifting heavy things–a useful improvement in everyday life. By increasing metabolism during and after workouts, dumbbells can help promote fat loss. Dumbbells are also space and cost-efficient. A home gym can be implemented at a low financial cost, and the diameter of the weight discs on these machines is simply too small for your living environment with this in mind!