Australian athlete Cameron Wurf was engaged in an extraordinary double-header on Sunday when he ran a half marathon over 21.1 kilometres shortly after completing the famous Paris-Roubaix cycling race over 257km. He also kept up training on Monday, posting on the Strava portal that he cycled 50.5km in what he named a “lunch ride.” Ineos-Grenadiers rider Wurf, 39, finished 128th after 6 hours 11 minutes 14 seconds in the cycling classic featuring 54km on cobblestones in northern France, 22:44 minutes behind Dutch winner Mathieu van der Poel. Less than three hours later he ran the half-marathon d…