# Why interval based endurance workouts?

**URL:** <https://www.trainerroad.com/forum/t/why-interval-based-endurance-workouts/108623>\
**Category:** Training\
**Created:** [January 6, 2026, 3:38am UTC](https://www.trainerroad.com/forum/t/why-interval-based-endurance-workouts/108623 "2026-01-06T03:38:45Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Hatch1776](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/hatch1776/32/44478_2.png) [@Hatch1776](https://www.trainerroad.com/forum/u/Hatch1776)\
**Post date:** [January 24, 2026, 2:59pm UTC](https://www.trainerroad.com/forum/t/why-interval-based-endurance-workouts/108623/23 "2026-01-24T14:59:27Z")

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> [@samuelsjohns](#):
>
> What is the thinking or science behind having these “intervals” during a zone 2 ride?

Exactly my question as well. I’ve heard that once you reach a very high fitness level, long sustained periods at your Z2 can still be quite taxing. I probably won’t reach that level of fitness or high amounts of training hours to get in that situation. 😀 Like you, I’m curious if my 1-2 hour indoor Z2 rides would be better served at a constant power. Or maybe it doesn’t really matter as long as we’re consistently following the workouts as was mentioned earlier.

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**Author:** ![Elgro](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/elgro/32/166633_2.png) [@Elgro](https://www.trainerroad.com/forum/u/Elgro)\
**Post date:** [January 24, 2026, 3:11pm UTC](https://www.trainerroad.com/forum/t/why-interval-based-endurance-workouts/108623/24 "2026-01-24T15:11:39Z")

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Ive done a couple recent 2 hour endurance workouts and it was 5x22 minutes alternating by 1 watt for each block.

Essentially just one giant Z2 block

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