This exercise defines your chest muscles, specifically the upper part.
Sit down on a incline bench with an angle of 45 to 65 degrees.
Slightly bend your elbows.
As you inhale, lower your arms to both sides until your elbows get one level with your shoulders.
Hold at the top for 1-2 seconds, and then, as you exhale, return to the starting position.
Do not practice this exercise with straight arms. Heavy weights can cause pain in your elbow joints.
Choose a right weight to be able to do the exercise with the full range of movement.