As I rounded the final corner to the finishing sprint of the Edinburgh Marathon, something finally made sense to me. I’ve read countless books and magazine articles on pacing your race, fuelling right and getting the right kit, hungry to know what I needed to do to get better.

One piece of advice stuck out at me: “A marathon is a 10k race with a 20 mile warm-up”. It seemed like one of those soundbites of wisdom that didn’t actually mean very much and certainly wouldn’t help when the going got tough. If you’ve ever read the words “Pain is inevitable, suffering is optional” in the comfort of you home and thought ‘this guy is on to something’ and then been reminded of them 17 miles into a marathon when the wheels have fallen off, you’ll know the sort of stuff I refer to.

At mile 20 of the Edinburgh Marathon I was feeling pretty good, too good I’d thought. Had I done something wrong? Was I going too slow? Everyone I chatted to that was also aiming for sub-4 seemed to be somewhere ahead of me now. But a glance at my splits every couple of miles told me I was bang on target pace.

Then I started to slow down. From mile 20 pace dropped by more than 30 seconds a mile. Running suddenly got tougher. Had I been on my target pace of 9:07 all the way round I’d have finished in 3 hours 59 seconds flat. This slowing between miles 20-23 would put me over my goal time by at least 30 heartbreaking seconds.

So I speeded up. It hurt like hell, but I ran as fast as my legs could carry me. I was overtaking everyone around me, it was hot, and it hurt, but from mile 23 to 26 I ran the fastest three miles of my whole race: 8:55, 8:56, 8:50, to finish in 3:59:31.

And that’s when it made sense to me. Logic says that running a marathon is hard, and therefore it will feel hard. But, you can’t push hard and feel you’re running to your limit all the way round a marathon like you can for a 10k. If the pace is right, the first half of a marathon, at least, should feel pretty good.

Good pacing is about getting yourself to a point in the race where you can push hard for home – even if that means you’re still going at the same speed that you started at. It’s the balance between feeling good and feeling that you can’t give any more. It’s that 20 mile warm-up for a 10k race. And, maybe I’m late to the party, but I ‘get’ it now.