# TR Training Variability

**URL:** <https://forum.intervals.icu/t/tr-training-variability/132537>\
**Category:** Uncategorized\
**Created:** [21 September 2026 08:21 UTC](https://forum.intervals.icu/t/tr-training-variability/132537 "2026-09-21T08:21:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![R2Tom](https://forum.intervals.icu/user_avatar/forum.intervals.icu/r2tom/32/50144_2.png) [@R2Tom](https://forum.intervals.icu/u/R2Tom)\
**Post date:** [21 September 2026 10:17 UTC](https://forum.intervals.icu/t/tr-training-variability/132537/2 "2026-09-21T10:17:33Z")

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Could be possible with using a formula

> [@Easy custom formulas on fitness charts](https://forum.intervals.icu/t/easy-custom-formulas-on-fitness-charts/123646):
>
> We (tx @ryandev ) have added support for custom formulas on custom charts on the /fitness page. These are simple math expressions and (hopefully!) easy for non-software developers to write. Here is a BMI chart: Choose “Custom Charts” → “Add” → “Chart” to add a new custom chart. Then do “Add Plot” and search for “Formula”: Click the little pencil under “Formula” on the table to exit the expression. Choose “Add Plot” to …

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