One simple body weight exercise that is highly beneficial to you is the plank exercise. This workout isn't so difficult but delivers so many benefits. It develops your core strength which makes your core muscles strong to support your spine and back. So, your body needs a strong core even to move. When the core muscles are strengthened, your whole body becomes strong. Here is what happens to your body if you perform this workout at least 4 times a week. Watch the video to know more.