# Allow users to choose alternatives to TSS

**URL:** <https://forum.intervals.icu/t/allow-users-to-choose-alternatives-to-tss/92351>\
**Category:** Feature Requests\
**Created:** [28 February 2025 18:04 UTC](https://forum.intervals.icu/t/allow-users-to-choose-alternatives-to-tss/92351 "2025-02-28T18:04:14Z")\
**Posts on this page:** 1\
**Showing post:** 6

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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:** [28 February 2025 20:33 UTC](https://forum.intervals.icu/t/allow-users-to-choose-alternatives-to-tss/92351/6 "2025-02-28T20:33:52Z")

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> [@PiotrekNL](#):
>
> Ok, so I go ride up the hill for 20minutes at 100% of FTP and my girlfriend drives me down home I will get fewer TSS than the next day when I ride only 10minutes, free wheel down and repeat. You don’t need a scientist to tell you it’s not right and you need high school math to improve on it.  
> Everything somehow correlated with effort does a good job. The key idea and why the whole system works is in CTL (fitness) not in TSS.

> [@Pause on Indoor Workouts affects TSS and Time in Zones](https://forum.intervals.icu/t/pause-on-indoor-workouts-affects-tss-and-time-in-zones/3598/2):
>
> Actually Intervals.icu does leave the pause out of the TSS calculation, it does that even if you don’t pause otherwise rides with punctures and coffee stops get inflated TSS. TSS of 151 for 4h30 doesn’t seem high. The time in zones info is incorrect. Intervals.icu uses “moving” to decide what to include there and this ride has no velocity or moving streams. I should be able to fix this because there is no data for that 90 min part.

It doesn’t count pause times to the TSS calculation. So in your example, if you would be driven home, it would end up in a similar TSS.

If you go downhill you don’t need another 10m, maybe 1m. so your TSS won’t be so high as in your first post.  
Just try it. So, in reality that is not a real problem, more a problem ‚on paper‘.

The formula is not perfect, but there is no better. What would be your better Load calculation?

> TSS = (sec x NP® x IF®)/(FTP x 3600) x 100  
> …where
> 
> - “sec” is duration of the workout in seconds,
> - “NP” is Normalized Power® (don’t worry about this for now),
> - “IF” is Intensity Factor® (a percentage of your FTP; in other words how intense the effort was),
> - “FTP” is Functional Threshold Power (your best average power for a one-hour race or test),
> - and “3600” is the number of seconds in an hour.

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