In fact, barbell bench press needs many auxiliary muscles such as arm strength, deltoid muscle and forearm. If you push the barbell from side to side with difficulty,

First, your auxiliary muscles are not strong enough to train your chest muscles.

Second, it means being overweight. Change a small barbell.

Third, maybe your movements are irregular, and you haven't found a regular movement yet.

You can practice with dumbbells first. The joint muscles of dumbbells are better than barbells.

Bench press: mainly practice the thickness of pectoralis major and thoracic groove.

Action: put the dumbbell on the bench with both hands, put the dumbbell on the shoulder, and palm up. Push the dumbbell up until the arm is straight, stop for a while, and then slowly recover. Tip: Push-ups and squats are curved, so that pectoralis major can be fully contracted and fully extended.