Regaining fitness after injury takes longer than most people plan for. On day 2064 of my daily barefoot running streak, 15,951.27 kilometres into a 40,075km lap of the world, I am learning this firsthand after breaking my foot 11 weeks ago.

Before the injury, I ran 7.5 kilometres every single day in barefoot-style Vibram FiveFingers. My pace sat between 5:00 and 5:30 per kilometre. My heart rate across those full runs was somewhere between 135 and 140 beats per minute. For someone running as part of a multi-year, multi-decade mission, those numbers were my settled baseline.

Then I broke my foot.

The 6-Week Threshold

There is a point in injury recovery worth understanding before you experience it firsthand: the 6-week mark. Return to training within 6 weeks of injury and your body retains much of its fitness. The adaptations you built, cardiovascular capacity, muscular conditioning, the specific demands of your training, those hold. You feel rusty for a week or two, then pick up close to where you left off.

Go past 6 weeks and the picture changes. The body begins to reverse those adaptations. Not overnight, and not completely, but the fitness unwinds. The longer the lay-off beyond that threshold, the further back the starting point.

At 10 to 11 weeks out, I am well past it.

What the Data Shows

The watch data is more honest than I would prefer. This morning, running at 6:00 per kilometre, already slower than my pre-injury pace, my heart rate was at 144 beats per minute after 0.75 of a kilometre. Before the injury, I would hold 135 to 140 bpm across the full 7.5 kilometres. Slower pace. Shorter distance. Higher heart rate. The numbers tell the story plainly.

During the 10 recovery weeks, I kept the streak alive by power walking and jeffing, a mix of walking and jogging, 5 kilometres per day. I thought I would hold most of my running fitness. I was wrong. Walking does not replicate running. The heart, the legs, the lungs adapt to the specific demands placed on them. Apply different demands for 10 weeks and you arrive back at running with a body shaped for something else.

Cross-training has value. Staying mobile through injury beats complete rest for many people. But cross-training preserves a general base, not a running-specific one. And when you are measuring yourself against a previous training standard, the distinction matters.

The Recovery Timeline

My honest estimate for the full rebuild from here:

2 to 4 more weeks to return to running 7.5 kilometres daily. The distance alone, not the fitness.

3 to 4 months after reaching that distance to rebuild the running fitness needed for serious marathon training. The heart rate zones need to normalise. The pace needs to return.

A 12-week marathon training block on top of that.

Add those together and the total from injury to competitive marathon readiness is close to a year. One broken foot, and the recovery arc stretches to nearly 12 months before I am back at the potential I had before the injury happened.

Adjusting the Targets

Before the foot broke, I was moving towards sub-3:15 for a marathon. The fitness felt like it was heading there. Now, with spring marathons roughly 16 weeks away, I am looking at the same events and thinking sub-4 hours would be a genuine result given where I am starting from.

The revised plan: sub-4 in spring, sub-3:30 later in the year if the base builds as expected, and sub-3:15 pushed back to the year after. Those are not consolation targets. They are honest ones for the position I am in, and they still point in the right direction.

What too many people do after injury is hold the same targets they carried before it. There is an assumption the body snaps back, with fitness stored somewhere waiting to be reclaimed. In practice, the training you did before the injury built the fitness. With the training gone for an extended period, the fitness fades. You are not retrieving something. You are rebuilding it, and that takes the time it takes.

Returning to training is the beginning of rebuilding fitness, not the end of it. Those are different stages, and conflating them leads to disappointment and, worse, premature pushes at pace and distance that set recovery back further.

The Mission Stays the Same

I am 15,951.27 kilometres into a 40,075km journey, running every day as part of a mission to raise £1 million for children's causes, including Great Ormond Street Hospital and BBC Children in Need. 24,123.73 kilometres remain.

Day 2064 is done. The streak holds. The pace is slower and the distances are shorter right now, but the direction does not change. This mission is measured in years, not weeks. One kilometre at a time is the only way to cover the ground.

If you are rebuilding after injury right now, set adjusted targets. Measure where you are today, not where you were. Do not underestimate the timeline. The 6-week rule is real. If you are past it, the rebuild is a longer road than it appears from the start of it.

Watch the full episode: https://youtu.be/t3otSn4K4ls