Redbigbananafeet
But aren't you just stating the pitfalls of competitiveness when you say that you aren't prepared to push the last 20% and that your son is happy with improving on his personal best? Taking the competitive angle to its logical extreme, the personal best would never be satisfying.
There must be many reasons why you don't want to push him all the way, and those reasons could be unpicked and examined and found to tie in with values which obviously matter to you.
But the question for me, increasingly, is how much do those values really matter. I see them as being tied in with self-actualisation and the notion that at the peak of existence is expressing yourself and all your interests and sense of identity. Increasingly, getting older, I'm thinking that it is easier to go through life forgetting about this and focusing on earning money and then doing something worthwhile with it, as well as surviving.
But that idea runs contrary to all the psychology ideas of the twentieth century. Nobody can blame families in Britain for not being pushy and not heavily controlling out children's interests - like screen-time - because it isn't the wisdom we've been brought up with, and the fear is that children may be harmed by being pushed. They probably wouldn't be if the idea was repackaged as working hard - which is what many adults spend their life doing, anyway.