Your complete first-timer's guide to 26.2 miles / 42.2 km: how long to train, what a plan looks like, how to pace and fuel, and the coaches' musts for finishing strong. Every year, thousands of people ...

You set out feeling good, maybe even a little ambitious. Then, everything starts to unravel midrun. Your legs lose their bounce, your breathing gets heavy, and a nagging side stitch makes every step ...