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@lovejustice Sports watches use a different, incompatible five zone model. That's why. Very confusing.

@jyne It isn't for naught. 60-70% of your maxHR is still useful cardio. It just isn't the same as zone 2 in the sense of zone 2 training, but slightly easier than that, and thus a slightly different stimulus. The whole zones approach is a simplification. The aerobic threshold depends on...

@lisa1971 There are altogether 26 bones in a foot. Sometimes, you can compete well with a broken foot bone, sometimes you can't compete at all.

@jyne OP uses Karvonen's formula, where Z2=60-70% of heart rate reserve. In Karvonen's formula, the aerobic threshold is at 0.7*(max HR-resting HR)+resting HR. With OP's numbers, that results in 131.4-144.3 for Z2, with the caveat that this is an estimate, not an exact range. You are using a...

@thespeedboy The 14 minute cap was way too high. Then they had to schedule the heats according to this cap.

@giftsigns Crossfit and unwatchable coverage because there is only one camera. Name a more iconic duo.