TONIGHT when I get home I will get changed, grab my now-battered trainers, and head straight out again before running up a few steep hills. Madness.
Why, you might ask. It's a question I frequently ask myself. In just over a month I will run further than I have ever run in my life before. The Cardiff Half Marathon.
Regular readers of the County Times might remember last year I one was of a team of three who ran the Man Vs Horse Marathon in Llanwrtyd Wells. My leg was around eight miles. Eight very hilly miles, mind. But a 'mere' eight miles.
So this is a considerable step up. Thirteen miles and a few hundreds yards. What's the betting those few hundred yards will be the worst of the lot?
Man V Horse was a massive challenge for me. At that point it was the first race I'd entered since year 11 cross country. And that was, from what I recall, compulsory.
At school I hated distance running. I wasn't that bad at it, just didn't see the point of any sport that didn't involve kicking a football while doing the running.
But football career over due to a knee injury, I'd needed to do some exercise.
I'd taken up running the year before, starting - reluctantly - with runs of about two miles. I was dragged round, kicking and screaming, before I finally began to enjoy it. The runs got longer and more physically demanding.
And then one fateful day I agreed, over a pint or five, to run the Man V Horse.
The training had to step up. There were hills to be conquered. And so for months we tackled the hills around Llanymynech and Llansanffraid twice-weekly.
Which brings us to now. Because the problem with running is there always another race. Always another challenge. Without realising it, a competitive side emerges that suddenly wants a challenge. And the challenges get bigger and bigger.
The next step had to be the half marathon. And Cardiff's Half Marathon has one thing that singled it out for me as my type of race - the course is flat.
Last week we tested our fitness levels. We drove into Welshpool, left the car, and ran back to Llanymynech. By my reckoning it's a distance of around 11 miles by canal. And those extra few miles seemed to make a massive difference.
The following day I was struggling to walk, although that was partly an ankle injury suffered on route. But it took a lot out of me, showed me how tough it will be.
However, we made it. And one hour 55 minutes wasn't a bad time, especially considering around Arddleen the footpath's barely flat, never mind the overgrowth.
And so tonight there'll be a leisurely hour or so before a 'beast' at the weekend.