I finally gave it a go with the Phil Hernon half body split today.
So it was
Pulldown
Row
Hammer curls
Leg curls
Abs
To remind you all of the routine, a set of around 12 reps to failure, take a breath, failure, take a breath, another set.
I put the weight down or let the bar go and took a breath before the next go....so a bit more than one breath but no much.
I usually got 2 then 1 rep but got 1 then 1 rep for rows.
The workout was quick and when it was over I felt like it wasn't enough. Until a few minutes later when everything just pumped up and I felt pretty spent. I'm not sure if I'll stick with it but may give it a go for a solid few weeks. Nothing to lose.