For Tim van Pelt, Thijs van Keulen and Dennis de Knijff it's not the first time they participated in the half marathon, but thanks to the interactive LED-shirt this competition is extra special.
"To keep fit, I do a lot of sports. I've competed in races before, but today it's extra special to run in this LED shirt for such an important goal as heart safety. No one is immune to cardiac arrest", says Tim, "Every year, 17,000 people in our country have a cardiac arrest outside the hospital. For them, we want help to be provided more quickly."