Lie on an decline bench set at an angle between 20 and 40 degrees. Be certain your feet are anchored to prevent them from slipping. Take an overhand grip with your hands about shoulder-width apart.
1. Inhale and slowly lower the bar until it reaches the lower edge of your pectorals.
2. Press the bar back up to starting position, exhaling as you complete the movement. Repeat the next repetition.
Notes:
This exercise emphasizes the pectoralis major (particularly the lower part for that nice cut), triceps, and anterior deltoids. It also places a secondary emphasis on the lower fold of the pectorals. Another various is to lower the bar to neck level, which helps stretch the pectoralis major subsequently increasing its flexibility.
You can also use a Smith-machine to perform this exercise.