Tom and Warren Knoll are approximately two-thirds of the way finished with a run across America. The father and son duo started on March 1 in San Diego with a goal to finish by July 4 in Washington, D.C. As of Monday, they passed through Altamont, Illinois, holding a strong 30-mile-a-day pace. The purpose of the 3,300-mile excursion is to raise funds for three admirable charities: the Wounded Warrior Foundation, which assists wounded veterans and their families, the Sunshine Foundation, which grants wishes to seriously ill and abused children, and the Challenged Athlete Foundation, which assists disabled athletes.

Tom Knoll, 75, ran across the country for the Sunshine Foundation in n 64 days, averaging 46 miles per day. The former Marine is also one of the founders of Ironman triathlon, and one of the first 15 finishers of the race distance in 1978. Warren Knoll, 44, plans to bike across the country after completing the run.

Track their progress at: usathleticevents.org