The injury thing is kind of 2 sided imo.
Like, sure, you can train and put yourself in a position to not get hit as much, etc.
Nico got concussed on a headshot against Buffalo. How do you prevent that?
Jack tripped on Binnington’s skate going full speed and went in the boards at full force. I mean, I guess you could avoid that, but going into the boards like that your chances of injury are extremely likely imo.
Jacks last two injury situation this season were bad luck. The trip on the goalie, the rando-twist that he got himself into. Definitely agree.
But before that:
Jack's shoulder injury (the first one a few seasons ago) was him getting overpowered in the corner by a bigger fella, and he fell the wrong way.
And then i think last season, his shoulder situation got aggravated in another hard hit in a corner, too, somewhat similar but with less extreme outcome.
The latter two references, is the stuff he can help to prevent by
a) getting damn stronger (as he should and as everyone else around him is, both his teammates and his opponents). I mean he is in the NHL and if he expects to not have a good off-ice season workout/strengthening, he will not last the long haul. Most of the players take that pretty seriously, and he is one who definitely needs to.
b) be aware to position himself a bit better to absorb the hits so he doesn't get "pounded" into the boards in a specific way.
obviously he was taking option c this season because he was already toast and needed surgery, but that shouldn't be the default option in most scenarios
c) avoid/disengage