I planned on a 5.5 mile after-work run but immediately on starting my legs felt so heavy I thought they belonged to an elephant. My head screamed "stop", but I plodded on and on. I reckoned I might let myself stop after 5k but not before.
It was really hard work and I could have stopped so many times but out of sheer bl***y - mindedness I refused to stop and even went an extra near mile. Result - my first 10k run (or just over) in just under 60 minutes.
Mind over matter