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Lower resting HR. Lower exercise HR. Higher HRV. Sounds like improved fitness, right? Not always. Here’s what your wearable might be missing. Training is going well; your data is certainly pointing in the right direction. Resting and exercising heart rates are dropping, and you’re seeing improvements in your heart rate variability (HRV). So why are your performances suffering? A few weeks ago, you were running a sub-20 Parkrun, but now you’re struggling to break 21 again. If

Your brain is very important in endurance performance. If you have taken part in an ultra-marathon, you have almost certainly had a moment where you wanted to quit—maybe a few. Hopefully, you didn’t! But maybe you did. The dreaded ‘did not finish’ (DNF) is a real possibility at every race. Statistically, around 5% to 15% of runners will drop out of a 50-miler, a figure that climbs to between 30% and 40% at the 100-mile distance. This number only increases further as factors,

Yes! These are my taped knees, perfectly demonstrating my ability to hear 'rest' and translate it to 'run anyway'. It’s fair to say I’ve had my share of injuries over the last couple of years-some from my own mistakes, others just from bad luck. Recently, I trapped myself in a frustrating injury spiral where a new issue would pop up the moment the last one healed. Looking back, I realise I was in denial. By refusing to accept the injury and pushing through the pain, I altered

The sub-2-hour marathon barrier has officially fallen in London. Read why Berlin later this year could push human limits even further into history.

In ultra-endurance sports, we understand injury in mechanical terms: a stress fracture, a strained ligament, or the familiar burn of tendonitis. These "hardware" issues follow predictable rehab pathways. But there is a different setback-the "software" failure. Here, the body’s internal processes are derailed by chronic stress, overtraining, or illness. Recovery is neither predictable nor linear. As I prepare for my sixth North Downs 50, I am preparing for more than a race.

In the 1920s, Paavo Nurmi famously carried a stopwatch to master pacing, known as the ‘flying Finn’ he is now widely credited as being among the first to apply scientific principles to running. It sounds incredibly basic but it was ground-breaking at the time because now he could get accurate timings over known distances and it worked. He ended up with 22 world records and nine Olympic golds! Fast forward to 1982 (but still in Finland) and Polar introduced the first wearable

Why do we fade late in a race? Explore the theory of physiological durability, the 'fourth dimension' of performance, and how you might build yours.