Jack Daniels was describing Threshold pace as being something between a person's 10K pace (30 minutes for the fast runners) and their marathon pace (best pace you can maintain for 2 or more hours).
Kind of struck me as funny. I mean it's hard to argue with... Most people's threshold pace will be between what they can run in a flat out 30 minute time trial and the time it takes them to run a marathon.
I guess his book was aimed at athletes a little faster than I am, is all. 30 minute 10K is only slightly more comprehensible than a two hour marathon for most of us- though the former might earn you a few thousand dollars while the latter would probably earn six or seven digits if you could do it consistently....
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