A decline push up is a variation of the basic push up that increases the difficulty significantly by placing your feet higher than your hands. Adjusting the bench height allows you to customize the intensity of your workout using just your body weight. Raising your feet up a bit slightly changes the angle of movement, providing a slightly different range of motion. This minor change works the muscles in a whole new way. The decline push up is one of many different ways you can modify a push up, so go ahead and add it to your workouts once a week or so?
Learn to do it right: Decline Push Ups