There is a really useful website: intervals.icu that will analyze your workouts and estimate FTP. I use it for Rowing and Running power metrics too.

Happy New Year 2023 Andy!

Thanks for your feedback

Our rides are designed so that you can control the intensity by choosing the method that suits you best: Power, Heart Rate or Perception of Exertion (RPE). Any of the three methods is valid so that you can complete your rides safely and efficiently.

If you have an Indoor Bike that measures power, this is the method we recommend. As you say, estimating your FTP is essential in order to establish Power Training Zones. You can do this by performing a test or by using the tool you can find in this link:

https://theridestudiobykeiser.com/intensityzones/index.html

Remember to use this advice as a starting point to determining your Training Zones and always at your own risk.