Jeff Waldmuller was fitted with a prosthetic leg after a motorcycle accident with a semi truck in 2009. Since his recovery, Waldmuller says he is more fit and active than ever, taking up mountain biking, running and volleyball. JEFF LAUTENBERGER/Tulsa World

After his accident, Jeff Waldmuller was originally determined to keep his leg but was frustrated with being unable to be physically active. After a visit to Scott Sabolich Prosthetics where Waldmuller met Roderick Green, an amputee sprinter and basketball star, his mind was made up to go for the prosthesis. JEFF LAUTENBERGER/Tulsa World

Jeff Waldmuller drags his bike up an incline before setting off an a trail ride near Lake Hefner in Oklahoma City. JEFF LAUTENBERGER/Tulsa World

Jeff Waldmuller mountain bikes on the Bluff Creek Trail near Lake Hefner in Oklahoma City on Sept. 20, 2011. Waldmuller has been able to secure sponsorships from the Challenged Athletes Foundation and other paralympic programs to buy equipment and participate in events. JEFF LAUTENBERGER/Tulsa World

With his running leg slung over his shoulder, Jeff Waldmuller waits for an elevator in the lobby of his downtown Oklahoma City apartment with girlfriend Mary Slavik on Sept. 20, 2011. The two have been dating for six months. JEFF LAUTENBERGER/Tulsa World