Hey gang. I am new to Karate. My son has been practicing TKD for the past five years and we recently moved to KY. In our area, they kind of co-mingle Karate and TKD together. His new school is hosting a tournament where they have sparring (continuous and four man division). I am used to WTF tournaments and have no idea what a four man division is. I tried to look it up and it seems it is common in MMA, but I still don't understand the idea behind it. Any help would be great.