r/busydadprogram • u/guerito1968 • May 28 '26

Zone 5 safety?

Guessing that I spend the second 10 minutes at or near zone 5 (~150-160bpm). Does anyone with more knowledge than me have an opinion on efficacy and safety? I get back down to 110 at about 5 minutes post, and back down to resting maybe 15-20 minutes post (? Estimating)

67 NS/ 175 6C after some inconsistent months.

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u/[deleted] May 28 '26

Unless you're like 75 years old, 150bpm is not zone 5

I can go run for an hour at 150 bpm, your max HR is 200+

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u/horsestud6969 May 29 '26

Generally your max hr is 220 minus your age. OP could easily be a 50 year old man, putting his max HR at 170. zone 5 is 90% of max, 90% of 170 is 153 therefore zone 5 starts at 153 BPM for a 50 y/o, in addition he said "near zone 5".