> You are doing nothing that requires the formula to be precise. Exactly. My guess is that neither are most other readers and commenters here. (Any evidence t

> You are doing nothing that requires the formula to be precise. Exactly. My guess is that neither are most other readers and commenters here. (Any evidence to the contrary?) Meanwhile, what do those error bars tell use about "training based on heart rate percentages." :-) > someone doing serious training Care to say what you mean?