My son bought me a slim book on rock climbing techniques. Rock climbing was my brother Brian’s gig, but I could see doing it when my knees knock me out of CrossFit. It’s something I did in college back when we belayed using ropes wrapped around our body (no belay hardware).
The book talks about single finger pinch holds. Specifically, it says not to try them until at least two years of building up tendons and ligaments.
Two years is a fair amount of time. I’ve not seen that mentioned in any clinical references I read. I suspect it’s right though; it’s obvious muscles can develop much faster than tendons.
I think we should be more aware of this in CrossFit training. Young muscles develop fast, but ligaments and tendons take time. To lift heavy things safely we need connective tissue to be at least as strong as muscles (ideally stronger).
In my 60th year I lift significantly heavier things than I did when I was younger-Old. Probably heavier than I could have done in my mid 30s. My muscles are somewhat stronger, but I think a lot of that is connective tissue development, and that took years. More than two years for Olds I think.