Kneel down on the floor and place your hands flat on the floor and slightly wider than shoulder width apart. With your shoulders directly over your hands,straighten your arms. Move your feet back,placing your toes on the floor,so that your knees are off the floor and your legs are straight. At this point,your body should form a straight line from your shoulders to your ankles. Your body should remain straight throughout this exercise. Keep your head and neck in line with your body so that your are looking down toward the floor. This is the starting position. In a controlled fashion,lower your body down toward the floor,bending your elbows,until your body is nearly touching the floor. Now,push your body up away from the floor,straightening your arms,until you have returned to the starting position. If you need to reduce the intensity of this exercise you can perform the pushup from your knees.