Running a 5:31 mile is impressive. But walking one? That’s unfathomable to most people.

Tom Bosworth, a British Olympic race walker, clocked 5:31.08 on Saturday at the London Diamond League track meet, which is a world record. The previous mark was 5:36.9, set in 1990. His 800-meter split was 2:45.72.

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Race walking requires that athletes maintain contact with the ground at all times, according to U.S.A. Track & Field. Walkers must keep the leading leg straightened as the foot contacts the ground, and remain straightened until the leg passes under the body. The movement is watched by judges, who can issue fouls and disqualifications, according to USATF.

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During his record-setting walk, Bosworth received two warnings, according to Athletics Weekly. A third would have disqualified him, but he appeared to slow his pace slightly in the second half to avoid that fate. He also was awarded a $15,000 bonus for the world record, Athletics Weekly reported.

Bosworth will compete in the 20K, which takes place on the roads, at the IAAF World Outdoor Championships in August in London.

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