A lot of people have done research on dumbbells, barbells and dumbbells are used for training in our training process. The experimental results show that the effects of barbell and dumbbell press on the chest muscles and biceps are mostly the same, but for the exercise of the biceps, the stabilizing effect of dumbbells will be more obvious, and more muscle groups can be involved, and the effect is significant. It also ensures its own stability.http://www.luchfitness.com/free-weight/