Duration/TSS for Threshold Workouts?

[jarsson]

Threshold Progression

This is a complement to the Sweet Spot Progression thread which is starting to fill with a discussion about threshold and VO2 (or all things coming after one completes an extensive aerobic phase). When deciding how to structure my next phase of training that would come on the tails of completing an extensive aerobic block (mine was 6 weeks long) I decided that building power from the bottom up would be the next best step, followed by raising the roof (VO2 max work) which would help prep for an …