I think trying to be cool is the worst possible ambition - and I have never suffered from it.
I learned what I need to do in the long jump, what I needed to do in the javelin and I've been able to rectify those events. It's been a bit of a learning curve, which is good.
It may not be impossible, but that our Faculties may be so construed, as always to deceive us in the things we judge most certain and assured.