alt Hacker NewsIt's not inherently unhitable. Overarm bowling is a relatively recent development in the history of the sport (rather like overarm serves in tennis). But of course, in this case, the ball was simply rolled along the ground rather than being bowled on the usual understanding of the term.
I did play some cricket as a child, and couldn't stand it... But I do remember that we started by underarm bowling. I've no idea whether this is a standard way of teaching it. I did learn overarm bowling. My one moment of joy in cricket was managing to bowl out some boy who was bullying me who was batting at the time. He kept protesting it.
I remember most of it involving standing around waiting for a solid ball to fly through the air at you.