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People always look at me slightly confused when I say this. A 5K is only 5 kilometres. How can it be harder than a marathon? Because a 5K done properly is four to twenty five minutes of sustained, near maximum effort with nowhere to hide and no pacing games to play. You go out hard, you hold on, and you spend the last kilometre in a place that’s genuinely painful. A marathon has strategy, variation, nutrition, pacing shifts, highs and lows. A fast 5K is just suffering, compressed. My 5K PB of just over 19 minutes felt harder in the moment than anything I’ve done at marathon or ultra distance. Not longer. Harder. The intensity is a completely different experience. I think people underestimate the 5K because of the distance. They train for it casually and then wonder why they can’t break their PB. If you want to genuinely race a 5K, you need to train specifically for that intensity. Long slow running helps your base. But if you want to go under 20, under 25, whatever your target is, you need to spend time running at and above that pace in training. The 5K rewards the runners who respect it. What’s your 5K target and when did you last train specifically for it? Comment Half below and I’ll send you my free Half Marathon Training Plan which includes the speed work that transfers directly to faster 5K times too.