Ultra Endurance Required for the Sahara

Three ultra-endurance athletes ran the equivalent of about two marathons a day for 111 days to become the first modern runners to cross the Sahara Desert's grueling 4,000 miles."I would never consider crossing the Sahara on foot again," said American runner Charlie Engle, 44, hours after he and the others completed the run at the Red Sea.Engle, Ray Zahab, 38, of Canada and Kevin Lin, 30, of Taiwan ran through Senegal, Mauritania, Mali, Niger, Libya and Egypt. Temperatures could top 100 degrees in the day and drop below freezing at night.