I don't usually post here because I'm not that much of a runner, though I'm gradually trying to get there.

But today I got myself a new mental prop. Running is pretty hard work to me, and I like using mental images and music to keep me focussed. And struggling up one of the small, steep hills on my semi-commute run I started thinking how these tough little hills where I feel slow and unfit are the ones that are actually making me strong, not the easy stretches where I just fly. And I got the image of loading a spring, like winding up something. Loading a spring is hard work, and you have to put in a steady effort rather than a short burst. But once it's loaded you can release all that energy later.

Works for me :-)