Thousands of runners on  Fitzwilliam Street Upper for the start of last year’s Dublin Marathon. The expected figure of 19,500 runners this year is well up on last year’s 13,000 total. Photograph: Cathal Noonan/Inpho

Trouble can come at you from all directions in the Dublin Marathon. Cramp, stitch, or even worse, like a few years ago when a dog ran out in front of(...)