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The 38-year-old retired from football for the second time in July, having come back to play for boyhood club Groningen.
However the Netherlands legend only played seven times in all competitions and decided to call it a day.
But he's still keeping himself fit and active and on Sunday, participated in the Rotterdam Marathon. For years fans have enjoyed seeing dart down the flanks, cutting in on that trusty left foot and curling one into the top bins.
Arjen Robben completed the first marathon of his life over the weekend.- GOAL News (@GoalNews) April 11, 2022
No rest in retirement :runner: pic.twitter.com/03xYtFG6hf
His pace has never been in doubt and he still had that blistering speed in his final years at Bayern. This, however, was a different type of challenge as Robben had to keep a steadier pace for a longer period of time.
Linksbacks gek maken. Dat vond Arjen Robben leuk. 42 kilometer lang kapot gaan in Rotterdam. Dat vindt 'ie minder. pic.twitter.com/bndfkogsrs- NOS Sport (@NOSsport) April 10, 2022
It was a gruelling 26.2 mile course all around Rotterdam but Robben did it in three hours, 13 minutes and 40 seconds.
He ran the race alongside Erben Wennemars, a former Dutch speed skater who set three world records during his career.
Robben, who won league titles in Holland, England, Spain and Germany, averaged a hugely impressive pace of 7 minutes and 23 seconds per mile.
But footage of Robben running the race shows him feeling the effects of such a mammoth sporting task and he admitted afterwards it was a "real fight".
"Not fun, it really wasn't fun. I made it, but that's about it. I often went deep and had to fight often enough, but this was also a real fight," the former Netherlands international told local channel Rijnmond, via Goal.
"That audience on the side helps you so much. Thanks to everyone for that, that got me through. In the beginning I was a bit preoccupied with a time, but at a certain point you throw that overboard.
"Then it's surviving and entering my first marathon. Then you notice what something like that does to your body, but I made it."
Robben is regarded as one of the best Dutch players of all-time and scored over 200 goals in a trophy-laden career.