The prodigious kicking success of England rugby player Johnny Wilkinson's may come down to what he does with his arms -- but it is not just his trademark preparation stance that does the trick.

5 Tips for Kicking Butt During Your Next Cardio Kickboxing Class We've got advice for preventing injuries and looking like a badass. by Ashley Oerman Published: Aug 20, 2014 10:41 AM EDT ...