So I have some advice for you gents @MarkKO @Frank_C @painter27
I found that I would get stitches or back pumps when doing my run portions in wods etc, and it was completely my breathing
A trick I learnt of an elite level crossfitter was to breathe to the “dun dun clap” of we will rock you by queen
It sounded ridiculous until I tried it
The “dun dun” is 2 short but deep breaths in, and the “clap” is a medium forced exhale
When timing it to your steps, you will build a pretty decent pace
In my mid toeens I was clocked at a state sprinting carnival of 100m at 10.97s so have always been fast over short distances, but this little breathing technique has aloud me to run for longer distances then ever before