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HRE
RE: LYDIARD OR DANIELS?
Defining aerobic and anaerobic here may well set off a whole flurry of responses. When Arthur was using the terms he simply considered anaerobic work to be any running that left you feeling breathless and aerobic work was anything that didn't.
I suppose somewhere in here there would be recognition that pretty much any running will elevate your breathing somewhat, so anaerobic running would be running which leaves you noticably breathless for more than a few seconds.
Generally speaking he did not think of 100 meter repeats as anaerobic because you supposedly do not produce lactic acid if you're running hard for less than 20 seconds. But he wanted you to take long recoveries, 200-300 meters, because running 100s with short recoveries could make a session of them anaerobic.
But again, he used these terms forty or so years ago when people weren't quite so precise in their terminloogy so someone else may offer another description of what constitutes aerobic and anaerobic work.

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