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’Dyw’r rhaglen yma ddim ar gael ar BBC iPlayer ar hyn o bryd

Josh Griffiths: Mr Marathon

Stori anhygoel Josh Griffiths enillodd Bencampwriaeth Marathon Prydain wrth gystadlu ym Marathon Llundain 2017. Josh Griffiths and the hard work behind his success in the London Marathon.

24 o funudau

Darllediad diwethaf

Mer 11 Ebr 201822:00
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