You can find more videos like this by joining MH Runner's Club here...www.mhrunnersclub.co.uk.
I also have a FREE Facbook community where friendly runners share their daily exercise. / mhhealthandfitnesscommunity
This video discusses why your official marathon time isn't the same as what your Garmin and Strava records for the 26.2 miles.
For those of you who have run a major marathon this will now explain the differences. For those of you who are coming to run a marathon, this will help to calm your mind when you see differing numbers.