The chest press targets the upper body. In particular, you can train the chest, triceps, and deltoid muscles. 

How to set up and use a chest press machine
Start by adjusting the seat to a height where you can line up the handle with the center of your chest. To determine the right weight for the exercise, start with about 25% of your body weight. Then increase each set to 10-10 kilograms before completing 10 repetitions. Select weight and use your feet. This will return the handle to its original position.

Chest compression device
With your back against the mat, press the handle without locking your elbows. Press the chest in the chest and breathe.
Go slowly and don't match your chest. Anything off the chest puts more weight on your shoulders.
Exhale as you bring the handle to your chest. Do 3-4 sets of 10-12 reps (for beginners). After each set, put your feet back on the step pedal. Next, lower your arms to the sides and slowly lower the handles back to the resting position.

A word of caution and common mistakes
People with shoulder limitations should always use the pedal when returning the handlebars to the starting position. If you often feel pain or pressure in the front of your shoulder, avoid placing your hands too close to your chest.

Often people do this exercise too quickly and don't get the full benefits of exercise. Chest presses are designed to be slow, controlled movements. Remember to inhale as you slowly lower the handle to chest level. Then, firmly push the handle away from your body and exhale.