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  • I think I did it based on rpm so I was 80 rpm for 20 and then up to 120 for the 40. Hard to put a percentage on it at it gets harder to maintain the rpm as you approach the end of the interval. This was recommended for me when I was (trying) to train for track so something approaching 80-90% maybe cumulatively by the end?

  • Thanks. I don't do them often but they kill me and I'd never be able to hold 40 secs so wondering if I was putting too much effort.

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