3 x 20 mins @ sweet spot = 60mins @ sweet spot?

You are either trying to move your power UP or OUT, as in doing 20min at progressively higher power or doing the same initial power but at longer times, 30-40-60mins.

TR tries to both at the same time. Take SSBMV for instance. First workout is 3x12 @85% and last workout (in SSBMV2) is 3x30 @90%.

A related thread to read through with some great comments:

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