I'd pretty much agree with Clinton, but I'm not sure about:

...when it HURTS, stop! That's what pain is... your bodies way of telling you to stop!

I'm assuming that Clinton means when it REALLY hurts. If so the advice is good. Giving up because it's slightly uncomfortable, isn't good advice.

I can't remember who said it, but whoever said that if you play so long that your fingers start to bleed, you're probably on to something may have a point.