The correct dumbbell recommendation method is as follows:
First, the starting posture: lying on the bench, holding dumbbells in both hands, shoulder blades close together, waist bent, feet on the ground to maintain stability. At the beginning, the fist is opposite to the eyes, and the dumbbells are in a line.
Second, the skill of doing the action: push the dumbbell up, and slightly close the dumbbell, exhale after the action is completed, return to the starting position smoothly, and inhale. When doing training, pay attention to the trajectory of dumbbells. You should press the dumbbell firmly, extend your elbows to both sides and move your arms in the same vertical plane. Putting the dumbbells together slightly can expand the range of activities of the chest muscles and enhance the effect of the whole training. Don't straighten your arms completely to avoid putting too much pressure on the triceps brachii.