Somewhere along the way, film and television got it into their heads that the medieval knight armor were so heavy that it restricted their movement. One common belief is that the armor was so heavy that knights going into battle had to be hoisted onto their horses with the help of a crane.  While going into battle fully protected by armor would be important to a soldier of any era, those of us who have worn body armor in combat will tell you the body armor also has to be functional. After...