1。 You can get the first two deltoid muscles by pressing the dumbbell, or you can only consider the dumbbell neck pressing or the back neck zipper, but they are all high-risk actions, and it is not recommended for novices to do them. Too much practice will put a lot of pressure on the neck. It is suggested to use a curved dumbbell to lift horizontally at the back with moderate weight, otherwise it may lead to irregular movements and fail to achieve the effect of exercise.

2。 Simply developing the front center sill can make the shoulders look faster, but it will give people a hunchback feeling and be ugly. Moreover, the lines of biceps brachii and deltoid muscle can not be well separated and portrayed, which affects the aesthetic feeling. It is recommended to do both, and we must practice together.