Intervals are so great - I used to think it was all about endurance, and felt it was counter-productive/cheating to constantly stop and walk. But intervals help build both speed and endurance, while at the same time being much easier on my knee. Brilliant!
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Intervals are so great - I used to think it was all about endurance, and felt it was counter-productive/cheating to constantly stop and walk. But intervals help build both speed and endurance, while at the same time being much easier on my knee. Brilliant!