I haven't seen Ali's blog you speak of but I can say as a 35 yo who's been riding trials for 20 years... stretch, balance, take care of your body, do CARs every day, Google them. If something's bothering you take care of it before you ride, it may turn into something bigger and take more time away.
Ali doesn't drink so he'll have less pains as an old geezer compared to any party people on the tour... booze is an amazing substance but really is poison for the body.
about 4 years ago I had a crash that snapped my left collarbone and scapula, I never went to rehab (you have no idea what it is like in America when you aren't rich)- just lifted rocks on my own. It felt fine. 18 months ago I crashed on my right shoulder, basically put my right hand to my left butt check with my arm straight behind my back. 4 months later ona road bike I went straight into the metal corner of a rod iron fence at 20 mph... with only my right shoulder and helmet. Helmet destroyed, shoulder destroyed.
Almost a year and a half later I'm still doing rehab and haven't touched a trials bike. Through working with a great physical trainer (neuro kinetic therapy practitioner) I've found out so many things about the human body and how it works... I spend time every day on the shoulder and proper posture, proper body mechanics that are broken down in the modern era of sitting all day doing nothing.
I'm learning these body skills so I can continue riding pain free into my 40s, 50s.... 60s?? 70s?? Who knows.
And that's my long rant on a Saturday morning while cuddling dogs in the bed.