Dumbbell arm flexion and extension at the back of the neck Concentrated curl Lateral curl How many a

80% of the maximum load you can bear 8

The standard dumbbell curl arm cannot be straightened, and in professional parlance, the elbow joint cannot be locked. If the elbow is fully extended, there are two negative effects:

1. After the elbow joint is fully straightened, the biceps brachii will be in a relatively relaxed state, which will greatly reduce the effect of biceps exercise.

2. After the muscles are relaxed, the joints will lose the protection of the muscles, and the force will be borne by the elbow joint, which will easily lead to elbow injuries during training.

Answer]: aa[Analysis] The work of overcoming the resistance of pure chain friends and making the movement of the movement link in the direction of muscle tension is called restraint work. In the slow descent phase of the dumbbell bend arm lift, the work done by the brachialis muscles is restraint work.

Approximately 3 months to form Persistence.

Correct Answer: a

Analysis: a[Analysis] The work of muscle contraction to overcome the middle force of resistance and make the movement link move in the direction of muscle tension is called restraint work. In the slow descent phase of the dumbbell bent arm lift, the brachial muscles do the work of staring and guessing is to restrain the early type of work.

1. When raised on the shoulder, the biceps contraction and the triceps relax.

2. When lifting, the biceps brachii relaxes and the triceps contraction.

3. Lifting heavy objects must be two muscles working together, just to see which of the sharp muscles exert more force and contract more under different operations. If the hand is straighter, the triceps is mainly forced, the biceps is closed, and the biceps is lifted upwards, the biceps will be more difficult to exert and the biceps contract is different depending on the lifting angle.

The barbell bicep curl is a hail silver bino eggplant preparation action to develop the strength of the shoulder joint

a.That's right. b.Mistake.

Correct answer: B

Dumbbell neck back arm flexion is a very effective exercise to train the back and arm muscles. To do this, you need to raise the dumbbell above your head, then bend your elbows to place the dumbbell behind your neck, then lift the dumbbell with your arms straight, and finally bend your arms to bring the dumbbells back behind your neck.

The training effect of dumbbell neck and back arm flexion and extension is very significant, which can effectively enhance the strength and endurance of the back and arm muscles, and at the same time can improve the shape of the muscles and make the body more toned.

When performing the training of dumbbell neck and rear arm flexion and extension, the following points need to be noted:

1.Choose the right weight: When you first start your practice, you should choose lighter dumbbells and gradually increase the weight. Excessive weight can lead to erratic training and easy injury.

2.Correct posture: Dumbbell neck back arm flexion needs to keep the body stable, feet shoulder-width apart, and back straight. Bend and straighten the arms in a correct posture.

3.Control speed: When the brother shouts to carry out the training of dumbbell neck and back arm flexion and extension, pay attention to the speed of control action, not too fast or too slow. During the lifting of dumbbells, it is necessary to control slowly and maintain the tension of the muscles.

4.Consistent training: Dumbbell neck and back arm flexion and extension require long-term persistence to achieve the best results. It is recommended to train 2-3 times a week for 20-30 minutes each session.

Dumbbell neck back arm flexion is a very effective action to train the back and arm muscles, with the right training methods and consistent training can help you build muscle strength and endurance, making the body more toned.