I'm curious to know how fast you think a professional athlete built for speed over 100-400 metres could run 10ks, half marathons and marathons. A friend of mine (non runner) thought I was talking bollocks when I said I believed I could beat an Olympic standard sprinter over 10k or a half marathon. I figured a runner built for speed and carrying a lot of muscle would struggle to run a half decent time for a distance event. What do you guys think? I mean I don't even know if sprinters do any long runs as part of their training.