Is software development a sprint or a marathon? No idea. But you could probably ask Marijn, since his 3 biggest hobbies are running, developing, and running some more. Somewhat lagging behind, you'll also find concerts, traveling, reading and the occasional cookie splurge that comes with being a calorie-burning road warrior. Furthermore, Marijn describes himself as "madly in love", but Dimitri Vegas & Like Mike sure as hell won't be spinning at his wedding.