Taekwondo is a form of martial ... with either a closed fist or the outer edge of your open hand, and with your feet. They also teach defensive blocks with your arms and legs.

An curved arrow pointing right. Sixteen-year-old Taekwondo champion Kerim Ahmetspahic smashed 111 concrete block with his head to break a Guinness World Record. He did it in just 35 seconds while ...

A taekwondo champion has smashed his way into the record books by breaking 111 building blocks with his head ... the Guinness book of records was on hand to witness the record.