Endurance Racing - Marathon des Sables

Participants walk across a sandy pass during fourth and longest stage of the 22nd Marathon des Sables between jebel Zireg and west of Kfiroun (43.8 miles). The Marathon des Sables is a 6 days and 151 miles endurance race with food self sufficiency across the Sahara Desert in Morocco. Each participant must carry his, or her, own backpack containing food, sleeping gear and other material. (Photo by Christophe Dupont Elise/Icon SMI/Icon Sport Media via Getty Images)