I wanted to do 1-minute intervals today because I'm anaerobically challenged. So I decided to do crank them out at a couple of notches below eyes-bleeding intensity so I could do a fair amount of them, and then proceed "until failure." That occurred after the 8th one, about one hour into the workout. As I was ready to noodle home, it occurred to me that I felt at the end of that interval about the same way I feel at the end of a 60-minute race, when it's time to sprint but I typically have nothing left to give. "Until failure" is coming a little too soon. So I did one more. And then one more. And another one after that. They weren't as strong as the first 8, but I think that's OK. You can sprint in the first 1/3 of the race when you're still fresh, but it probably won't put you on the podium.
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