people (like him) who have never tried what she is doing don't really know what they are talking about.
Here is what he has wrong:
1) you can be fast on low mileage
2) you don't have to cross-train the same amount of time because there is not a 1:1 ratio for whatever reason. For example: anyone who bikes and runs know a 1 hour bike does not equate to a 1 hour run. Most would agree that it is closer to 2-2.5 hour bike = 1 hour run.
I row and feel that :30 on a rower = 1 hour run. I have done 1 hour on the rower and that really equates to a 20 miler run (2 hour effort). I don't know who arc trainer translates time wise but if you really want to know, don't ask mojohns like this, ask those who actually do cross-training because they are the ones who know.
my formula is this:
row = 2x running
run = 2x biking
back to his point about she can't be this fast doing X amount of running miles. He does not know.
I ran 25-40 miles per week when I was 24 for about 9 months after college (where i was running 70-90 most weeks with lower weeks as well). By running just 4 days per week and running fresh all the time and cross training on what used to be my easy days, I got considerably better/faster. By his logic, this would not have happened. I did not lower my mileage for injury issues or because i couldn't handle high mileage (years later I have run as high as 210 miles in a week = with no injuries). Which type of training made me fastest?
actually the low mileage did with high quality and cross-training (the exact opposite of what he is claiming)