I started bouldering late last year and have plateaued at around a V4 level. I feel like my biggest weakness by far is my finger strength, so I’m thinking of starting hangboarding to work on that.
I’m not sure where to start though, I feel like I already tax my fingers when climbing so I don’t want to go overboard and injure myself.
It’s still easy to overdo sub-max hanging though. You don’t get any feedback until it’s already too late. You only start noticing the problem on your next session.
That’s why I was recommending 50% bodyweight if they decide to start now.