<P> These different punch types can be thrown in rapid succession to form combinations or "combos ." The most common is the jab and cross combination, nicknamed the "one - two combo ." This is usually an effective combination, because the jab blocks the opponent's view of the cross, making it easier to land cleanly and forcefully . </P> <P> A large, swinging circular punch starting from a cocked - back position with the arm at a longer extension than the hook and all of the fighter's weight behind it is sometimes referred to as a "roundhouse," "haymaker," "overhand," or sucker - punch . Relying on body weight and centripetal force within a wide arc, the roundhouse can be a powerful blow, but it is often a wild and uncontrolled punch that leaves the fighter delivering it off balance and with an open guard . </P> <P> Wide, looping punches have the further disadvantage of taking more time to deliver, giving the opponent ample warning to react and counter . For this reason, the haymaker or roundhouse is not a conventional punch, and is regarded by trainers as a mark of poor technique or desperation . Sometimes it has been used, because of its immense potential power, to finish off an already staggering opponent who seems unable or unlikely to take advantage of the poor position it leaves the puncher in . </P> <P> Another unconventional punch is the rarely used bolo punch, in which the opponent swings an arm out several times in a wide arc, usually as a distraction, before delivering with either that or the other arm . </P>

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