Did you ever wonder why so many martial arts train with the left side forward? Did you ever wonder why some people just cannot seem to take a punch to the body? Well, check this out:

The liver is vulnerable on the right side of the body just below the floating ribs; it is also vulnerable straight into the solar plexus, just below the xyphoid process of the sternum.

There is a reason behind everything you are taught; even if you do not realize it.