When creating a magic buckets workout from a choose my training interface the interval duration looks like this (13s in this case).
Changing the challenge level to 9 (for example) the UI still says the interval duration is 13s but in fact the workout is now setup with 22s intervals.
If I manually change the interval duration to 78s I get one interval (lol) that matches the interface.
Maybe the UI is working as intended and I need to reframe how I think about it. 
S
Itâs still a very new concept, but appears to be working as expected 
We designed it such that moving up 1 Challenge Level is equivalent to moving 10% closer to a breakthrough at the target power. e.g. at the end of CL 1, youâre 10% of the way to a breakthrough at your target power. After completing CL 5, youâre 50% of the way to a breakthrough at your target power. Completing CL 10 would put you right on the verge of a breakthrough - donât stop when youâre there - keep pushing!
I suspect there is confusion between reaching higher CLâs & maintaining your Challenge Level.
Interval durations donât vary at different CLs because your proximity to MPA makes higher CLâs more training efficient. Doing 350 W efforts when your MPA is 1100 W is different than doing 350W efforts when your MPA is 700 W. Xert knows this & gives you more credit for doing efforts under fatigue, even if the duration of the efforts is the same. Looking only at time in zones will never account for the effects of fatigue, since they would weight those two situations equally.
Hereâs a free-styled example. IIRC, I did the first âsetâ around CL6, then CL 5, & finally CL 4.
Can I jump in here and ask is it just me or is the default CL set to 4 OR is it dependent on available time, required XSS, algorithm, maths etc.
I think the default is 1. edit: I was wrong ⌠it defaults to â2â for me.
Hi @ManofSteele! Thanks so much for the reply.
I am more asking about the UI itself and how the interval durations as displayed dont match the interval durations in the chart itself after updating the challenge level.
It is a very small thing but I though the interval duration (number of seconds) was going to agree with the chart (number of seconds).
Not for me, Iâll ask support!
I wonder if it is because of how I got to that part of the interface? Basically XERT had a workout already ready for me and then I went into change it and selected to Magic Buckets tab. It does appear that it defaults to â2â for me in all the scheduled workout cases Iâve just checked.
Doesnât CL default to the level that matches todayâs Difficulty which also relates to estimated workout duration?
For example, if the goal today is 138 XSS in ~1h50m minutes that equates to 3-diamond Difficulty (138/1.8=76 XSS hour).
Select the Magic Buckets tab and youâll see the appropriate CL, target watts, and interval duration for a workout ~2 hours with a 3-diamond rating.
You can then tweak things by raising or lowering CL.
Lower CL and estimated time to complete the workout increases while Difficulty declines.
Raise CL and estimated time decreases while Difficulty increases.
In my experiments the interval seconds remain the same until you move past CL 5 and then some intervals will increase in duration and most or all increase if you move to CL 9. That change in seconds isnât indicated on the form (bug?), but if you change interval duration with the slider that value does update on the form.
Thanks for the reply - that makes sense!
Iâve done a few of the XMB AI generated workouts. Iâm enjoying them. However, I notice that the Peak (red) and Intensity (yellow) buckets forecast for the workout and actual after the workout are quite different. Last one was forecast at 4.3/11.4/83/99 and I got 2.4/7.5/92/102. The higher (2 instead of 83) low intensity is expected as I did a ramp warm up before I started the workout. However, I am surprised and the dramatically lower high intensity number (2.4 instead of 4.3) as I completed the workout as specified.
Iâm riding a trainer, wahoo kickr bike, using its power as I do for 95% of my riding and all of my intense rides. I did the workout in erg mode.
Is the AI compensating for my slightly tired state? Or is the erg starting 1s latish enough to do this? Should I, and is there a way to start with a slightly more ambitious XMB so I end up closer to target (like extending the 13s intervals to 14s)?
FWIW I perform some portion of most HIT workouts in Slope mode.
There is no way to fail workouts this way. Simply do your best and if you monitor the workout with XMB you can fill any bucket gaps before youâre done.
Thank you @ridgerider2 ! I had totally forgotten that 3 years ago when I set up my Wahoo I set power smoothing on. Took it off. Even on todayâs Pure Endurance ride I could tell that Xert was better able to evaluate my power profile. Iâll let you know how it goes when I next do a XMB AI generated workout.
