RE: Why can I run really fast sometimes and really struggle at other times?
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I used to run a lot. Even did heart rate training for a period and it turned out to be the best training I ever did. Less injuries and all. As far as your issue. I am not sure, but I did ask ChatGPT and the response makes sense. I will also ask my oldest son. HE is a chiro doc and a certified strength and conditioning coach.
Below is a snap from the chatgpt:
Why you can be fast and struggle at 5K
A few likely explanations:
You’re probably more power-dominant than endurance-adapted.
That means your body is great at short efforts but not as efficient at clearing fatigue over longer efforts.
Your pacing perception might be off.
If you’re used to sprinting, a “cruise” pace can feel weirdly uncomfortable because it sits right in that in-between zone, not easy, not all-out.
Your aerobic base might just not be built yet.
Totally normal. Sprint ability doesn’t automatically translate to endurance.
The key insight
You’re not “worse” at running.
You’re just specialized right now.
Some people are diesel engines.
You’re more like a sports car.
If you wanted to balance it out
Without overcomplicating it, the missing pieces are usually:
Easy longer runs (build aerobic base)
Tempo runs (teach your body to hold effort)
Consistent pacing practice
And the good news?
Endurance is much more trainable than raw sprint speed.
Oh, how kind of you @coinjoe! Thank you so much 🙏
So, that was an interesting idea to prompt ChatGPT. Knowing my own running history and health well, the key things that stood out and are useful for me to play with are:
I'm lacking an aerobic base right now.
I can build an aerobic base.
I should probably go back to heart rate training again.
And, there is hope, because: