As someone absolutely new to Xert, I think you and I are on the same page. I think your fitness signature absolutely has to be correct. We discussed this in another thread I posted a few weeks back and ultimately I knew that my fitness signature was incorrect for my current fitness.
I ultimately did a race that I know I was all out on and took its signature as my current signature to start training from. If it is incorrect I will most likely find out at my next race in a few weeks but for now I think Xert is missing out on correct end of/beginning of season training for riders/users.
Maybe I am wrong and I dont understand how to use xert correctly still.
If you care to read our discussion it can be found here;