CrossFit isn't for everybody, but it works for me. This is my attempt to tell you why.
The WOD today included box jumps, kettlebell swings, and push-ups. I was ready to use the 12" box, like usual, but Jeremy asked me to try the 18" box. I did and I did for the workout. 30-20-10. It took a lot out of me, but I did it. The kettlebell swings were actually worse. 36 pounds is heavy. Jeez. But that box - I did it.
Watch out 20" box - you're next!