John Kiara, 15, jumps over his friend at Shangilia skatepark in Nairobi, Kenya. Shangilia is Kenya's first and only skatepark located in the slum of Kibagare, where Kiara also lives. For now he skates the park nearly every day, as he doesn't have a chance to attend high school due to high tuition fees.

Kasey Kahne, driver of the #5 Great Clips Chevrolet, pits during the NASCAR Sprint Cup Series Pennsylvania 400 at Pocono Raceway on August 1, 2016 in Long Pond, Pennsylvania. The race was delayed due to inclement weather on Sunday, July 31.

Vansbrosimningen is an annual open water swimming competition held in Vansbro, Sweden since 1950. The 16,000 participants swim three kilometers in rivers, the last kilometer against the current.

(L to R) Kevin Gibson, Naveida Huggins, Kendal Wallin and Hannah Lutz participate in the 2015 Mud Tug event held on the Rochester Institute of Technology campus in Henrietta, N.Y. on Sept. 19, 2015. Mud Tug is an annual event hosted by Zeta Tau Alpha sorority and Phi Kappa Psi fraternity. Teams of 10 compete in a tug of war tournament over pits of mud.