Sure enough, my muscles are SORE! The back of my thighs and right behind me knees are sore! That kicking uses a whole lot of different muscles. My arms are sore. I love it! I love the good soreness that comes from a good workout. Today I didn't run. My exercise was in the form of housework. That's a feat in itself. Cleaning up after 5 kids, not an easy task. Tomorrow I hope to run. I'd love to go outside and run, but we'll see what I have time for. I still have a lot of cleaning to do.