Show Notes
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Time spent at or close to your VO2max has been FINALLY proven to be the MAIN factor for performance gains. Now, go hard!
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BUT make sure you are not JUST going hard. It seems that you also need a high 4mmol threshold and some higher levels of training volume (read: fat oxidation) to make this work.
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SHORTER intervals (30s on / 15s off) might be better for you, if you are struggling to get a high threshold % during your intervals.