Hello... I am the Queen of the Side Stitch. 80% of my running involves me getting a side stitch or working hard to not get one. I rarely run and do not get one.
I have found out that it is all related to my breathing... the faster I run... the harder I breathe... and POP there is the side stitch.
Once I feel one coming on, I slow the pace... and I breathe deep. Sometimes this works... other times it doesn't. When it's really bad, I shove some fingers into it. That really helps to massage it out. I also sometimes bend over towards the side cramp... that helps too. At my last tri, I ran a 10:20 minute mile doing all of this. HA!
My coach also says that side cramps can happen if you are cosuming too many calories too close to the run. So, I make sure that I don't eat anything at least 2 hours before a run. Although, for me, I don't think my side cramps are due to eating too close to a run. But, I still do it.
Wish him luck from all us... I'm sure he will do just fine.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"