A differently-abled American athlete has broken world records by walking the fastest 20 metres using only his hands. By walking 20 metres in 4.78 seconds, Zion Clark, 23, set a new Guinness World Record (GWR).

Watch | Born without legs, US man breaks world record for fastest 20 metres on hands

American sprinter Sha'Carri Richardson will not be selected to the U.S. 4x100-metre relay team for the 2020 Olympic Games in Tokyo after she accepted a one-month ban for testing positive for cannabis.

Tokyo Olympics: Sha'Carri Richardson not selected to US relay team after testing positive for cannabis

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Watch | Born without legs, US man breaks world record for fastest 20 metres on hands

Tokyo Olympics: Sha'Carri Richardson not selected to US relay team after testing positive for cannabis