Using dumbbells or doing push-ups and bench presses is the best action to train chest muscles, and it is also the favorite action of many bodybuilders. Most trainers mainly use barbell bench press-indeed, this is the best action to train the upper body, which is very effective for 80% of trainers. What about 20%? The answer is dumbbell bench press. In addition, you can try to practice dumbbell bench press after barbell bench press for a period of time, and you will feel different. Starting posture: Lie on your back on a flat bench with your feet flat on the ground. Bend your elbow and hold the dumbbell, with your fist facing your eyes and your palm facing your leg. The axis of the dumbbell is above the nipple 1 cm (in the middle of the pectoral muscle) and close to your chest. Action process: push-ups, elbow contraction, elbow clamping and chest clamping. The dumbbell moves upward and leans forward slightly, showing a parabolic trajectory. When the arms are straight, the center of gravity of the dumbbell is close to the support point of the shoulder joint. But don't just sit on the support point of the shoulder joint, because this will make the bones support the weight of the dumbbell (this situation that the bones support the weight instead of the muscles supports the weight is called "locking"), which will make the chest muscles relax and affect the exercise effect. Then, make the two arms straight and open to both sides, and the two arms slowly bend, and the dumbbell falls vertically, and when it drops to the lowest place, it is pushed up. Say it again. Breathing method: inhale when lifting and exhale when falling. Key exercise parts: pectoralis major, deltoid and triceps brachii. Training points: 1, don't hunch your back or hold your breath, which will make your muscles out of control and dangerous. 2. While practicing pectoralis major, we should strengthen the exercise of upper arm triceps brachii. Without developed triceps, it is impossible to bench press heavy barbells and develop developed pectoralis major muscles. 3. At the beginning, the axis of dumbbell should be placed above nipple 1 cm (middle part of pectoralis major) to make pectoralis major exert force. If the dumbbell is raised on the shoulder, you can only exercise the shoulder muscles. 4, be sure to pay attention to open your elbows, and open your arms at your sides when doing bench press, so you can basically rely on your chest muscles to complete the action. The pectoralis major should be exercised at wide intervals, and the deltoid should be exercised at narrow intervals. 5. The effect of chest muscle exercise is not ideal. You can try to press upward, lie on a sloping board with a certain inclination (about 20-25 degrees), and then practice with barbells or dumbbells of the same weight. Give your muscles a new stimulus from another angle, and you will soon see new effects. Number and times of groups: 1, reaching the limit times within the range of 6-8 times. After more than 8 times, other parts of the body will enter aerobic exercise; If it is less than 6 times, it means that the auxiliary muscle participates in the exercise, but the main muscle is not completely tired. 2, multi-group number: no matter which part of the body, you should practice one group after another until the synapse can't make an impulse. If you believe in overtraining, you can't meet this requirement. The so-called overtraining is just an excuse made up by cowards to cover up their incompetence. The real impact exercise should not only reach more than 20 groups, but also reach the limit number of times in each group. Don't count the warm-up group when counting the number of groups, although it is necessary. 3. Diversity of training. It is necessary to change the number and frequency of training groups and the arrangement of movements frequently, so as to break the adaptation of the body and obtain a breakthrough in muscle growth.