David Tua is taking on one of his "toughest" challenges in the ring. The Samoan boxing legend has shared his journey while getting a pe'a in a boxing ring. Tua posted a series of photos of himself undergoing the painful process on Instagram. Tua finished his boxing career with a record of 52-5-2 (43 by KO) and is one of the most prolific knockout artists in the history of the sport. [photo: Instagram via New Zealand Herald]