Can someone clue me into what this indicates? Using Lat machine as an example 3 sets X 5 X 5 X 5 reps? I'm used to seeing sets X reps and somehow there are two other numerical variables in there? If this rep speed or cadence or time between reps? Also some exercises have only 1 extra variable (rear delt cable for instance) versus 2?
I think, it simply looks like the number of repetitions in a given set.
For example: 5x5x5 is 3 sets of 5 repetitions each.
6x4x5x7 is 4 sets, one with 6 repetitions, the other with 4 repetitions, etc.
He has some way of strictly sticking to the specified low number of repetitions. We'll see how it goes.
As for the rest of what you wrote, I'll add, as a curiosity, that I once saw a Russian program in which the author claimed that 3 reps were enough to stimulate hypertrophy. Interesting theory.











































































