It's perhaps the most often debated question when training for a marathon...
How long should my long run be?
You have plans such as the Hansons method advocating not going longer than 16 miles and plans such as Hal Higdon going as far as 22 (and some coaches suggest running the full 26.2 in training).
How do you know what's right for you? Why are some distances more effective than others?
Coach Sinead breaks down the science behind the marathon long run and shows you why you might be over-estimating the distance you actually need to run.