For twenty + years, I was a very serious rock climber, and climbed 5.12.
Like a number of climbers, I gravitated to a climbing wall as efficient training, as you can get in a lot of reps quickly. One session, I popped a tendon in my middle finger on my right hand, working out on a climbing wall. It took a YEAR to heal, and 15 years later the middle joint is still distended. As we age, it seems to take progressively longer to heal injuries. I also had a 40 per cent tear in my right wrist, surgically repaired, as a result repeated diving playing volleyball.
I am, as a result, very conservative when it comes to things like intensive strength training. I do find that frequent shooting and dry firing is good for my strength, but try to use common sense to listen to my body, and stop when things hurt.