Part of the joy of bouldering for me has been putting tons of pressure on my tendons/joints/pulleys and then figuring out how to get them conditioned to endure the strain. I used to get such bad tennis elbow that I would have to lay on the floor after climbing, elbows just aching for 1-2 hours. Stretching, long warmups, yoga, foam rolling & other fascial releases, diet (collagen & fish oil especially) have gotten them to the point where they can take an insane amount of abuse and keep going, Now I am working on my fingers :).

There is a kind of glamorization of these really intense training sessions in the workout community, but the real work and struggle is rehabilitating injuries, and having the patience for the best practices that allow you to train hard safely at the next level.