Originally Posted by
rubiksoval
But that's something a bit different. I'd suggest if you're trying to maximize gains in vo2 max, you need to do them quite a bit harder (115%+). And the only way to do that is with quite a bit more rest (generally in the realm of 1:1).
The 6x5x1 is more like something I'd expect to be more specific to FTP (especially in that 105%-110% range) and giving it a bit of a "pull up".
Yes, you're correct. These are pull-up FTP sessions, and very effective at that. I thought Drew10 was asking about raising FTP without a PM. In my experience a mix of sweetspot to push from below and 6x5+1 to pull from above is a good combination: they are hard but not so fatiguing that they'll wipe you out for several days and so are repeatable.