Eric Futch of the United States prepares for the start of the 400-meter hurdles at the IAAF World Junior Championships on Wednesday, July 11 in Barcelona, Spain.
Competitors swim through mud underneath electrified wires during the Tough Mudder at Mt. Snow in West Dover, Vermont on Sunday, July 15. The Tough Mudder is a 9-mile endurance event which runs competitors through a military-style obstacle course complete with mud, water and fire.
Young male gymnasts (bottom) stretch their legs as a female gymnast jumps on a stage at a local sports school in Jiaxing, China on Tuesday, July 10.
See more: NBC News - The Week in Sports Pictures: July 9 – July 15