How to run a halfmarathon with (almost) no training? - Lemmy.world

This Saturday I’ll participate in a charity run where you find people sponsoring you and they will donate based on how many laps (400m) you manage to run in 2 hours. My longest run so far was a 10 km run with a pace of 5:30 (very exhausted afterwards) and once with a pace of 6:15 (felt like I could have gone another 30 mins, however my HR steadily climbed from around 160 to 180 at the end). My two questions to you experienced runners: 1. What would a good strategy for running the longest distance possible in 2 hours? 2. Is my HR an issue? It didn’t seem to really stabilize and was around 180 for the last 10 mins. Will it plateau if I run more than the 60 mins or will I run out of energy before? PS: I know running that long without proper training might be stupid but I’m determined to make my sponsors pay.