This method is a great way to reach muscular failure multiple times in quick succession. Perform a set to failure, take 10 deep breaths and go again. Aim for about half the repetitions that you got out during the initial set. Repeat this as many times we stipulate and you will increase your time under tension with your working weight. In a short amount of time you can add extra reps onto your working set and truly fatigue the target muscle groups.
For example - If you are presented with Rest Pause x 2
- Complete the working set to failure (say you get 16 reps) Take 10 deep breaths
- Go again to failure and aim for 8 reps (half of the 16) Take 10 deep breaths
- Go again to failure and aim for 4 reps