So says Glenn:
Pain is usually your body telling you that something's wrong, so it's natural to try to avoid it or be frightened by it. When an exercise hurts, first decide if you're in any real danger. If you're not, tell yourself, "It's only pain. I'm not in any danger, I'm not going to die, and the pain will go away. It's temporary, and it's only pain."
At first I thought he was messing with me. Then I was annoyed with him for giving me terrible advice.
But sure enough, the next time I found myself in that situation I told myself, "It's only pain..." and it worked! I stopped being afraid of it, gritted my teeth & just accepted that it was part of the deal. I accepted what it was and what it wasn't, and it became a lot easier to live with.
Why not give it a shot?