In this article, athletics coach Cathal Logue (who has a 5k PR of 15 minutes 36 seconds . . . ) walks us through the training modalities he recommends for how to run 5k in 20 minutes or less.Whether you’re an experienced runner with several marathons or half-marathons under your belt, or you are pretty new to the running game, running a 5k in 20 minutes is an achievable goal. Incase you’re wondering… 5km = 3.107 miles