When a run doesn't go to plan, the lesson lands harder than any session I could have written into a training plan. Today marked day 2076 of my daily run streak, and a route above Burnley, up in the Pennines, turned into the most physically demanding and mentally unsettling few miles I have covered in over five and a half years of running every single day.

I set off expecting a fairly standard trail run, fitted around a working day away from home. What I found instead was boggy marshland that swallowed me to the knee. Anyone who has spent time on northern moorland after heavy rainfall will know the type of ground I mean, but I had never experienced anything close to this. The sludge had the consistency of a thick milkshake, and at one point, as I sank further with each step, my first thought was that I had wandered into quicksand.

I run in a lot of different places, in a lot of different conditions, and I have always considered myself reasonably prepared for whatever terrain a route throws at me. Today tested that assumption properly. I am not a trail runner by trade. I have never enjoyed mud, and I have certainly never had cause to question whether I would get myself out of a situation under my own strength. For a short spell today, I did.

The context matters here. Heavy rainfall in that part of the country appears to have closed a number of footpaths, and I suspect the ground I found myself on was once a stream or a walked path that has since sludged over completely. There was no warning, no obvious sign that the path ahead would give way beneath me the way it did. That is the nature of adventurous running. Conditions shift. Ground that looks solid one week can be a different proposition the next.

What got me through was not luck alone. I run with navigation on my watch, so even mid-panic, I had a way to locate a route out of the wilderness rather than guessing at direction. I also have a colleague who knew I was out running today, which meant that had things gone further wrong, there was someone who could have raised the alarm. Neither of these things felt significant when I set off this morning. Both felt essential by the time I climbed out, covered head to foot in mud, shaken but upright.

The lesson for me is straightforward: preparation is not about expecting the worst on every run, it is about building in the small safeguards that mean the worst case does not become dangerous. Wearing gear suited to the conditions I might meet, not just the conditions I expect. Carrying navigation rather than relying on memory or a mapped route that assumes the terrain stays fixed. Telling someone where I am, every time, without exception. None of these things are dramatic. All of them mattered today.

There is a wider point here about resilience, which is the whole foundation of this mission. A streak built across 2076 consecutive days is not built on days that go well. It is built on days like today, where the plan falls apart within the first mile and the only option left is to keep moving, adapt, and find a way through. I have run through illness, through injury scares, through weather that has tried to talk me out of leaving the house. Today added a new one to that list: ground that tried to swallow me.

Perspective matters because this mission was never framed around comfort. I am running the equivalent of a lap of the world, 40,075 kilometres, in barefoot-style footwear, one streak day at a time, to raise £1 million for children's causes through Great Ormond Street Hospital and BBC Children in Need. As of today I have covered 16,016.38 kilometres, which leaves 24,058.62 kilometres still to run. That number does not move because of one difficult morning in the Pennines. It moves because I get back out the next day regardless of what the last one demanded of me.

I will pick a more paved route through that particular stretch of moorland next time. That is not weakness, it is common sense learned the hard way. But the streak continues, the distance keeps closing, and the reason behind all of it stays exactly the same: every kilometre covered, including the muddy ones, is one step closer to the children this mission exists to help.

If you follow this journey, or if today's episode is the first time you have come across it, I would ask you to consider what your own version of an unplanned mile looks like, and whether you have the small safeguards in place that would get you through it. And if you believe in what this mission is trying to do for children's lives, following along, sharing an episode, or supporting the fundraising directly all make a genuine difference to how far this reaches.

Watch the full episode: https://youtu.be/j2GSqttdCFM