I had a thought and not sure if it’s possible to track. But in future versions of Xert would it be possible to incorporate a bigger picture of what stresses you take on off of the bike? Maybe by using fitibt data (heart rate, steps, sleep)? Maybe this isn’t accurate enough, but I feel just capturing the data from an exercise isn’t the whole picture of actually how tired you are.
How other factors should be used to influence training prescription will need a fairly big change. Most systems allow you to input stress or strain scores but this isn’t the correct approach since some stress/stain may impact your training without providing any improvement.