I was training and doing regular FTP tests and went from 220W to 240W FTP over the course of 4 months. My friends who are Xert users recommended Xert to me and I subscribed. Shortly after Xert showed lots of breakthroughs and TP of 262 and then 285 within a week. Those numbers, as much as I’d like to believe them, seemed too high. My friends explained to me that TP and FTP are not exactly same, however when I tried to do Xert workouts, it was so hard, I couldn’t complete them. After few tries I was not really working out and just rode since the weather outdoors got better. I finally did an FTP test today on a trainer to validate or invalidate Xert numbers. My 20 min NP was 260W for that 20min lap so used 95% of avg power to determine my actual FTP, which was 247W. That’s a HUGE difference from 285W and explains why I couldn’t complete Xert workouts. I have a year worth of Xert subscription and I would like to be able to rely on Xert’s algorithms to get to correct numbers and not fiddle around with intensity % to be able to do workouts. Hope someone from Xert can help with this.
Editing to add more information:
- My training was on Wahoo Kickr indoors on TrainingPeaks/Zwift by FasCat
- Many Xert breakthroughs happened once I started to ride outside, using Quarq power meter on my bike
- I was suspicious about differences in power meter readings and compared the two on zwiftpower and turned out there was minimal 1-2% difference