Home chest exercise: Push Up

As we all know, Push Up is probably the most common chest exercise. Maybe because that chest exercise don't need any equipment. And it's strange for us to see how many people don't know the correct performance of this convenient, easy-to-use and effective exercise for pectoral muscles. So we created a video with complete instructions of how to perform Push Up exercise.
Breathing: inhale when moving down. Breath out when moving up.