Originally Posted by
redlude97
Did you change your FTP/LTHR? Strava's fitness calculation is kind of worthless because it doesn't let your set different values for ranges of time in a season even though they fluctuate with training.
I did make a small change in my FTP, but not sure why that would cause the fitness calc to go from 70-80 to mid 30's? I've tried putting it back to see if anything changes.