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by kashyapc 1314 days ago
Read up on heart-rate zones; this is a decent post[1]. Basically, you should be able to comfortably hold a conversation throughout the run. I learnt that many serious athletes train a lot for it. Improving zone-2 fitness apparently contributes in a non-trivial way to zone 3-5 fitness! But don't get too hung up on these stats (I didn't bother at all for the first 5 months of running), but follow that golden rule of "listen to your body" to differentiate "good pain" vs. "bad pain".

[1] https://www.polar.com/blog/running-heart-rate-zones-basics/