Grasp both handles while in a standing position. Make sure you are in line with the center point of the weight stack. This is your starting position.
Pull the weight in front of you at your upper chest line. Your arms should be slightly bent at the elbows. After, return to the starting position and repeat again for desired number of repetitions.
DO
DON'T
Control the weight at all times by doing the exercise in a smooth and fluid motion
Don't hunch your back
Don't let the weight pull your arms too far back on the negative (way back) portion of the movement
SPECIAL NOTES & LEVEL of DIFFICULTY VARIATIONS
To increase the level of difficulty, either slow down the motion or increase the weight
This is a classic exercise for the chest. One important thing to mention is that cable exercises for the chest are not for building muscle mass. They are primarily for shaping the chest muscles and getting the coveted muscle separation lines. Thus, if you goal is to build slabs of muscle onto your chest, then you should do barbell or dumbbell chest exercises.
Therefore, when you do this movement you don't really need to go really heavy with the chosen weight. Instead, focus on the movement and executing it perfectly in a controlled manner. The movement should be smooth and fluid with no sudden jerking motions.