Originally Posted by
fordfasterr
suppose you want to improve your 20mp, would it be better to try and push the HR a little higher during the 20 minute interval, or would it be better to just add ANOTHER 20 minute interval at the original LTHR / power level ?
maybe I should rephrase this question, pardon the self-quoted reply...:
If you have improved your 20 mp, did you achieve it by simply adding more 20 minute intervals to your 2x20's OR did you increase the effort of your normal 2x20 intervals?