Why bother. You don't need a power meter for that. An hour of effort is an hour of effort. You can do that kind of training just as well on HR.
I agree, it's not like you need to be doing complicated stuff around intervals, just pushing hard at threshold-ish levels for an hour. HR's perfect for that.
@andyp started
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Why bother. You don't need a power meter for that. An hour of effort is an hour of effort. You can do that kind of training just as well on HR.