 His accomplishment was the equivalent of running 622 marathons in 622 days in extremes of heat and cold.Denniss was a member of the Warilla North Primary School 4 x 100-metre relay team which won three consecutive New South Wales state titles from 1971 to 1973, setting state records in 1971 (Junior Boys 57.4 sec) and 1973 (Senior Boys 52.7 sec).