The bowler reaches his delivery stride by means of a “run-up”, although some bowlers with a very slow delivery take no more than a couple of steps before bowling. A fast bowler needs momentum and takes quite a long run-up, running very fast as he does so.
The fastest bowlers can deliver the ball at a speed of over 90 miles per hour (140 km/h) and they sometimes relay on sheer speed to try and defeat the batsman, who is forced to react very quickly. Other fast bowlers rely on a mixture of speed and guile. Some fast bowlers make use of the seam of the ball so that it “curves” or “swings” in flight. This type of delivery can deceive a batsman into mistiming his shot so that the ball touches the edge of the bat and can then be “caught behind” by the wicketkeeper or a slip fielder.
