comparing results from a workout with one set past failure, with workouts with 2,3,4,5, etc sets past failure.
heres another myth pushed by "h.i.t." guys = its impossible to do more than one set , if your doing the set with the extreme intensity that is required to get to TRUE failuire.
bullshit, of course you cant do as much weight for equal reps, as you get weaker after your first set, BUT, its ver possible to maintain extreme intensity from set to set and reach true failure - or even past failure.
the real question is = whats ideal?
and the answer is = whatever works best, at that very moment.