Although this exercise is considered one of the most common and versatile, it is very often performed incorrectly. For best results, only do as many reps as you can with proper form at first.
Bending your arms at the elbows, lower your body to a noticeable stretch in the muscles of your chest and arms. Control the movements with the help of the efforts of the muscles of these groups. Return to the starting position and repeat the exercise.
Starting position

Rest your hands on the parallel bars.
Fully straighten your arms, straighten your chest, slightly tilt your torso forward.
Implementation Recommendations

Avoid jerking and rocking the body. Movements should be slow and controlled.
Do not bring your shoulders in front and do not lift them. The chest should be straightened, the shoulder blades lowered.
The main efforts should fall on the muscles of the chest and triceps.
Rising on the uneven bars, exhale.