UFC legend Chuck Liddell has kept himself in great shape well into the downside of his career.  Now, we may know the secret to his success.  Liddell and his hot girlfriend Heidi recently appeared in an internet video working out completely naked.  I’m not really sure what the point of the no clothes is but luckily Liddell is blurred.  Unfortunately, Heidi is too.  I suggest if you feel like trying this, avoid doing this at your local gym…