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I think longer intervals are better. They're more race-specific. 1min on/off is working the wrong energy system - at least for half of it until I'm too fatigued to max out the minutes on.
My way might not add power but it does help me 'memorise' steady state pacing at the power level I'm aiming to hit. Towards the end of the week I will drop it, instead of 2x20 at FTP it'll be more like 1x15 or something at FTP. It'll all depend on how I feel though.
You're not going to get any more form before then. Do a 1 minute on/off session tonight for an hour then maybe just do an easy hour each day with a few race pace efforts.