Dumbbells from any site constraints, only 1 square meter of area can be trained. And dumbbell affordable, even the most high-end dumbbell not a few hundred dollars. When doing dumbbell exercises, two dumbbells are completely independent, if your training is not long, it is likely to do when the rickety action. So, in all dumbbell training, the body to maintain balance and stability will use all the muscles may be involved, including all the small muscles to help muscle and stability, and this exercise on our body is very useful, it can not only improve people coordination and control, but also make you look at the life of the action more elegant, more upright body. If your body muscles on both sides of asymmetry, can also do some unilateral training.