Originally Posted by Michelle Fivefer
The funny thing is that the commentators don't always see no-balls as a serious fault. They will wave one away saying it reflects the effort the bowler is putting in, as if the no-ball-free deliveries are somehow inferior. Not if the bowler bowls 2 or 3 in an over, though!
That is because when the quick bowler strains to get the extra couple of mph on a particular delivery, it is likely that he will overstretch in the delivery stride and stray beyond the crease.