Wow, a pair of shoes that come with a DVD! I laughed myself silly and continued laughing as I watched. Then I wore the shoes for 2 hours and had to take them off, my legs and butt hurt! I was a Marine and that is the last time I ever ran, but this brought back long repressed memories of that 'good' running burn. It took me a while to work back up to the 5 K walk with my dog and it's now a real workout. It's also very good for your posture, tilts your hips correctly and keeps your feet aligned correctly. I wear out the outside of my heels and I tore my knees up years ago rollerblading, so I know how important it is to keep my feet positioned or suffer bursa pain. No problem with these shoes. I love them! I bought them with a birthday gift certificate, now I am saving up for my future replacement. I love he fell of a run without running ;-)