This style favors closing inside an opponent, overwhelming them with pressure and flurries of hooks and uppercuts. They tend to be fast on their feet which can make them difficult to evade for a slower fighter. They also tend to have a good "chin" because this style usually involves being hit with many jabs before they can maneuver inside where they are more effective. Many swarmers are often either shorter fighters or fighters with shorter reaches, especially in the heavier classes, that have to get in close to be effective. Tommy Burns was the shortest Heavyweight champion at 5'7, while Rocky Marciano had the shortest reach at 67-68 inches. However, heavyweight Jack Dempsey (a modern cruiserweight in size) at nearly 6'1 in. tall with a 77 in. reach was an exception to the rule.