Originally Posted by arexjay

I'm going to do the 6x5' because, when I was first introduced to this style of threshold intervals, ZeCanon talked about doing 8x5'. Now, I see 6x5' in place of those, so I assume they are more effective. That's why. Definitely not the most sound reasoning, I know.

As far as the text you quoted, well, I know that I don't know a lot of the science behind this. What I wrote makes sense to me, but clearly not to anyone else. So I'll try to explain, please try bear with me: ZeCanon said "The first two feel easy - your anaerobic system is providing a good portion of the power. 3-end, you have exhausted anaerobic power and are relying entirely on the aerobic system." So, when I said "taking longer to stop using anerobic power," I assumed that the 8x5' intervals spent more time "exhausting anaerobic power" because they were at a lower intensity. I'm likely wrong, but that's okay. I'm learning. Thanks for at least taking the time to respond, everyone.