# Not understanding TR logic on these intervals **URL:** \ **Category:** Training\ **Created:** [January 29, 2024, 3:26pm UTC](https://www.trainerroad.com/forum/t/not-understanding-tr-logic-on-these-intervals/90429 "2024-01-29T15:26:04Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![ABG](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@ABG](https://www.trainerroad.com/forum/u/ABG)\ **Post date:** [January 30, 2024, 11:02am UTC](https://www.trainerroad.com/forum/t/not-understanding-tr-logic-on-these-intervals/90429/13 "2024-01-30T11:02:14Z")
Good thread about this topic also. At this point I want to extend time in zone. When I’m 8 weeks out, I think those 30/30 will have a place. > [@VO2 Max: Short vs Long Intervals](https://www.trainerroad.com/forum/t/vo2-max-short-vs-long-intervals/54538/17): > > This was in the back of my mind as well. I thought Spencer was certainly hard, but doable. Which to me indicates I need to go up on the power or extend. The custom version of Monadnock was 3min @ 122%, which was killer for 3 minutes. So if I’m doing 120, I need to go to 3:30 or beyond. Maybe that can be my progression for this 3-week build, either 3:30/4/4:30 at 120% or 3:30/4 at 120 and 3:30 at 122%. --- _[View the full topic](https://www.trainerroad.com/forum/t/not-understanding-tr-logic-on-these-intervals/90429)._