"I suppose a computer is the new basket-weaving. It’s become a stereotypical profession for disabled people," Clark says.

Eighty-five times he's pushed his disabled son, Rick, 26.2 miles in Marathons. Eight times he's not only pushed him 26.2 miles in a wheelchair but also towed him 2.4 miles in a dinghy while swimming and pedaled him 112 miles in a seat on the handlebars--all in the same day.