An updated formula for marathon-running success

Prediction calculators still give a rose-tinted view for most runners, says Fetcheveryone’s Ian Williams. He takes another look at the statsIt was a real pleasure to see my marathon time predictor featured in the Guardian a few months back. My algorithm uses data from more than a thousand runners of varying abilities who have logged their training here on Fetcheveryone, to come up with a better prediction of marathon time. You can try it here. It’s based on my view that the usefulnes