The other day, I was working out with my good friend Eric Chasko at his studio, Redemption Kettlebell Gym in East Windsor, NJ.  After our training session, we were discussing the mechanics of a basic kettlebell swing and Eric had me demo a few swings.  As I began demonstrating the basic kettlebell swing that I had been taught almost 10 years ago, he noticed a hitch in my movement during the back swing.  Instead of keeping my back flat, I was raising it slightly as the bell moved into back position.  This …