: At what point does running faster give diminishing returns? I understand that one has to run fast enough to get their heartrate at a sufficiently high level to improve cardiovascular and lung health, but at what point does

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At what point does running faster give diminishing returns?
I understand that one has to run fast enough to get their heartrate at a sufficiently high level to improve cardiovascular and lung health, but at what point does running faster give diminishing returns?

For example, and I'm making figures up, suppose one sees a 100% increase in cardiovascular and lung health going from 2.5mph to 5mph. Will they see another 100% return from 5mph to 10mph, or would they, say, only see an increase of 15%?

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