# Custom zones work started

**URL:** <https://forum.intervals.icu/t/custom-zones-work-started/112132>\
**Category:** Uncategorized\
**Created:** [16 September 2025 15:35 UTC](https://forum.intervals.icu/t/custom-zones-work-started/112132 "2025-09-16T15:35:29Z")\
**Posts on this page:** 1\
**Showing post:** 106

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**Author:** ![david](https://forum.intervals.icu/user_avatar/forum.intervals.icu/david/32/30189_2.png) [@david](https://forum.intervals.icu/u/david)\
**Post date:** [30 October 2025 15:18 UTC](https://forum.intervals.icu/t/custom-zones-work-started/112132/106 "2025-10-30T15:18:54Z")

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> [@Marchewka](#):
>
> I use 3 zone model with AeT and MSS and I would like to create workout for example between 75-85% of AeT

You need to make a zone for that. Custom zones can overlap.

> [@havella](#):
>
> How can we have the color of the custom zone be the one that shows in the workout chart in the calendar?

Unfortunately, that is very difficult to do.

> [@Mtschippert](#):
>
> in my example, I have 9 zones set up, effectively wanting cz1 to be 0-10%, cz2, 10%-20% etc…

The “time in zones” display on the workout viewer and editor now displays custom zones, if you are using them. If you are using only custom zones then the “normal” zones are not displayed.

 ![Screenshot 2025-10-30 at 17.17.16](https://forum.intervals.icu/uploads/default/original/3X/f/c/fc31bf24a834f58588bd2fc4cd1996c030e509cc.png)

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