Taekwondo
Even though some things in Tae Kwon Do have changed over the years, respect is not one of those things. Respect is the biggest part of Tae Kwon Do. Without respect Tae Kwon Do would not be the huge art it is today. Some of the things that have changed are the belts. The original colors are still the same, but every time you test you either receive a new belt or receive a stripe to place on you current belt. Legend has it that long ago there was just one belt. There still were colors though: white, the color the belt was originally;  yellow, the color achieved thorough sweat soaking into the belt; green, a color that came though practicing outside and falling; blue, the color of the sky; red, the color of blood; and black, the color of all the dirt mixing with everything else on the belt.