Xert for running +Stryd

Hello,
to start with, I’d like to say a few words about myself.
I’ve been running with power since 2016 (using Stryd, of course), but my training with power has been inconsistent.
Mainly because it was hard to find concrete solutions online. Time has passed, and over these 8 years, a lot has changed, both in my running and technological advancements. I’ve never been a professional athlete; I started running at the age of 30, but now I’m approaching 55 next year and would still like to fight for a sub-18:30/5 km. This year I managed 18:57, but I had very little running between January and June.
I’m writing all this to say that I have quite a good understanding of running, methodology, and that I’m a tech geek. So far, I’ve mainly used WKO5, but it’s only for analysis.
While I help a few people with training plans, I completely struggle to create a plan for myself. It’s always too much, too intense, etc.
Last month, I pondered for a long time about which plan to start preparing for the next season, and I chose the Stryd plans, which have notably improved since last year, yet it still wasn’t what I expected.
A few days ago, I remembered that I’ve had an account on Xert for a few years, never used, without any data, but I read that you can now use the platform for running training with Stryd.
So, I entered about 12 workouts (I don’t have more because I was using the old-generation Stryd, and currently, I’ve moved to the next-gen where CP differs significantly).
I know Xert needs more data, but as a start, after a few days of analyzing and working with the program, I find that it’s finally something that suits me, and I’m currently thrilled. I have a few remarks, but it’s too early to write about them, as I might not know the program well enough yet. If anyone has made it this far, I have one question regarding weight and training goals and program interpretation.

In Stryd, I have the standard weight set to 70 kg and I don’t change anything. Unfortunately, due to various upheavals, as well as detraining and vacations, my weight went from 72 to about 75. It’s not a big problem, but the generated plan for March 29 with a maximum 15-minute power of 313 Watt predicts 320 Watt.
But, how will the program behave as I slowly ‘lose’ weight to those 70 kg in the spring?
Because theoretically, the power won’t increase then but rather slightly decrease.
Should I leave the weight as it is in Stryd at 70 kg? Or should I assign the actual weight to each day? (which seems a bit illogical to me) but I don’t know the algorithm, so I’m not sure how Xert works.

Besides, once my monthly subscription ends, I plan to buy an annual one and write more about my running. English is not my native language, so I apologize for any mistakes.
Thanks
Robert

I believe Stryd uses your weight, in addition to the acceleration measurements, to calculate the power. The reported power will therefore be too high if you loose weight.

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Yes, it’s quite obvious that less weight = less power generated. However, with training, power should not decrease but at least maintain, assuming the training is effective. The question was how the Xert algorithm responds, whether it takes into account, for example, the speed/power or heart rate/power ratio in its calculations.