<human>:  Is Mixed martial arts totally original from Roman Colosseum games?
<bot>: No, Mixed martial arts is a full contact combat sport that is not totally original from Roman Colosseum games. Mixed Martial arts in the UFC takes place in an enclosed structure called The Octagon. The Roman Colosseum games were fought in enclosed arenas where combatants would fight until the last man was standing. Mixed martial arts contests are stopped when one of the combatants is incapacitated.