Fast bowling

Pace bowlers may be classified based on quantitative or qualitative attributes. A widespread method of classification is based on average ball release speed. However, there is no universally accepted set of definitions and the categorisation of bowlers according to speed may take into account competition level and gender. Terms used in different classifications include "slow medium", "medium", "fast medium", "fast" and "express". ESPNcricinfo, a popular cricket news website, uses both "medium fast" and "fast medium" in addition to "medium" and "fast". Bowlers may be categorised according to their use of swing bowling or seam bowling techniques, although the term "seamer" is also commonly used to refer to pace bowlers in general. == Strike bowling ==

Strike bowling is the term usually applied to bowlers who are used primarily to take wickets rather than restrict runs. Typically, strike bowlers work in short spells, either at the start of an innings or to confront new batters, although they are also employed tactically at other times. For fast bowlers, results can be achieved through sheer speed and aggression, rather than by trying to make the ball move through the air (swing bowling) or off the pitch (seam bowling). More commonly, however, a combined approach is adopted to produce balls that the batter finds difficult or impossible to play, whatever the speed at which they are delivered. In this respect, the inswinging yorker is a good example of delivery that, even when bowled relatively slowly, can nevertheless be highly effective. == Swing bowling ==

Swing bowlers cause the ball to move laterally through the air, rather than off the pitch like seam bowlers. Normal or conventional swing bowling is encouraged by the raised seam of the ball, and conventional swing is usually greatest when the ball is new and therefore has a pronounced seam. As the ball gets older, the wear makes swing more difficult to achieve, but this can be countered if the fielding team systematically polishes one side of the ball while allowing the other to become rough. When the ball has been polished highly on one side and not on the other and if the ball is bowled very fast (over ), it produces a reverse swing such that the ball swings in the opposite direction as in conventional swing. Contrary to popular opinion, this swing is not produced by air flowing faster over the smooth or "shiny" side as compared to the rough side. Swing is produced due to a net force acting on the ball from one side; that is, the side with the more turbulent boundary layer. For conventional swing bowling, the raised seam and the direction it points governs the direction of swing. Due to the angled seam of the ball, air flowing over the seam produces turbulence on the side that the seam is angled toward. This causes the boundary layer to separate from the surface of the ball later (further toward the rear of the ball) than the other side where it separates earlier (further forward on the surface). The resulting net force acts so as to move or swing the ball in the direction of the angled seam. Conventional swing bowling is delivered with the seam angled such that the smooth or polished side of the ball faces forward to move the ball in the direction of the seam i.e. toward the rough side. A swinging ball is classed as either an outswinger, which moves away from the batter, or an inswinger, which moves in toward the batter. == Risks of injuries ==

Fast bowlers typically experience the highest incidence of injury of all player roles in cricket. The largest time-loss injuries are typically associated with overuse at the site of the lumbar spine. Common injuries include spondylolisthesis (stress fracture of the lower back), navicular stress fractures in the foot, shoulder injuries or lesions, side strains or intercostal strains and muscular strains of the calves, hamstrings or spinal erectors. Popular media and commentators are often critical of the number of injuries suffered by fast bowlers. However, as of 2019, injury rates are at their lowest in decades, in many parts thanks to advances in physical conditioning, sport science, and load management interventions. ==Top five fast bowlers==

NB: The above figures all exclude matches in progress == See also ==