A good friend of mine told me she was taking her ten year old daughter to a birthday party. I perked right up when she told me the party goers would be attending a martial art dojo for a demo and partiticipation. "That's amazing," I said. "I imagine they'll tumble around and learn how to break boards. What a great party event." Obviously, I was biased as all get-out. Party day came and went. I asked "mom" how it shook out. She told me her daughter had a blast, as did most of the kids. "Most of the kids?" I asked, eyebrow cocked. "Yes, some of the kids were shy and didn't participate. Sat on parents laps and watched." "Oh," I mumbled gravely. "That's not good." Here's how it breaks down—my friend's daughter does gymnastics and currently attends hip hop classes. She LOVES her hip hop. Although, only ten years old, tumbling around on mats and hip hoppin' in front of other kids has built co...