A group of 12 retired Royal Marines, all over the age of 45 led by legendary polar explorer and retired Royal Marines Commando RSM, Barry ‘Baz’ Gray, have completed several arduous training runs in preparation for their gruelling world-record attempt on 21 July – a 26-mile (42km) marathon around the streets of London in full military kit, carrying 40lb (18kg) back-packs.
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