When I was a teenager, I practiced judo, and part of our training included running. There were times when I would run and run, and suddenly, I felt like I couldn’t take another step. My legs were heavy, my lungs were burning, and my body was shouting at me, “That’s it. You’re done.”

And yet, if I kept going just a little longer, something amazing would happen. I would catch my second wind. Suddenly, the exhaustion lifted, my strength returned, and I felt like I could run forever!