The image of Julian Nagelsmann zooming around the Bayern Munich training ground on a skateboard in 2021 left Germany polarized. Some saw the young coach as a breath of fresh air. Others thought he was too showy and his dress sense was lampooned. Fast forward three years and he is about to lead Germany into a home European Championship (June 14-July 14) at the age of just 36. His Bundesliga coaching debut came at 28 at Hoffenheim, the youngest boss the German top flight has ever known. From there he progressed quickly to RB Leipzig and then Bayern, winning the 2022 Bundesliga title before a sho…