Is It Good to Train the Same Lift in Different Volume and Intensity?

It seems to me failing on pull ups is the worst thing you can do for your elbow. I train my olympic snatch in every possible range i can think about. If it's olympic lifts, it's load and maybe everything else it would be what most people call intensity. But as you know, if you take my programming course, dan john university dot come, the hardest thing to understand in our field is,. what do you mean by intensity?