# Training load for interval sessions looks low compared to Z2 sessions **URL:** \ **Category:** Training\ **Created:** [19 June 2026 08:06 UTC](https://forum.intervals.icu/t/training-load-for-interval-sessions-looks-low-compared-to-z2-sessions/130450 "2026-06-19T08:06:40Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![MedTechCD](https://forum.intervals.icu/user_avatar/forum.intervals.icu/medtechcd/32/40383_2.png) [@MedTechCD](https://forum.intervals.icu/u/MedTechCD)\ **Post date:** [19 June 2026 08:48 UTC](https://forum.intervals.icu/t/training-load-for-interval-sessions-looks-low-compared-to-z2-sessions/130450/4 "2026-06-19T08:48:27Z")
There is XSS Strain Score > [@Three-dimensional impulse-response model](https://forum.intervals.icu/t/three-dimensional-impulse-response-model/109644): > > We have started implementing some of the ideas in this paper (Xert uses a similar model): Nothing is live yet but I like the first results. You get a trace with the relative contribution of each energy system (aerobic, glycolytic and PCr) as well as a strain measure that can be used to calculate a TSS like score (strain score = SS) for the activity. SS can be further broken down by energy system. (none of that is live yet) What I hope this will bring to… And there are a couple of users who tried to create their own load system. > [@Allow users to choose alternatives to TSS](https://forum.intervals.icu/t/allow-users-to-choose-alternatives-to-tss/92351): > > Hi, The topic of TSS keeps coming back. Various disadvantages of it were highlighted. I think it’s a shame we are still using it as it’s just so obviously bad it hurts the eyes and removes any kind of faith one can have in tools based on it. Glaring example is comparing two following workouts: 1)10m at 100% FTP, 10minutes at 0W, 10minutes at 100% FTP 2)20m at 100% FTP The first one can easily happen on hill repeats, the other needs a higher hill. 1) is obviously easier than 2) and yet produc… --- _[View the full topic](https://forum.intervals.icu/t/training-load-for-interval-sessions-looks-low-compared-to-z2-sessions/130450)._