Some of the Heavy Events have a known base in history. We know the Stone throw events evolved from ancient tests of strength, we know Sheave toss was derived from farm work, and we are pretty sure that Hammer Throw was a test among blacksmiths and the like.

Cabers I think are really just something they added as a "strong man" event, without much practical application. I cant think of anything you can do by tossing a log that way that isnt easier done at least three or four different, quicker ways.