Hello brain trust,
I just finished a VO2 max workout of an hour w an IF of .86. It was quite manageable. SS workouts at that IF are likewise hard but manageable. But a threshold workout at that IF KILLS me. I’m trying to diagnose what that means. Good cardio but bad leg strength? Etc. Thanks for any wisdom you might be able to provide. Assume it is not related to diet or rest, as the pattern is old.