Grinning mischievously, Juanjo Albizu dons a baseball cap, tucks his T-shirt neatly into his sweatpants and adjusts the velcro straps on his elbow pads before positioning his skateboard on the bowl's edge, ready for the "drop". Albizu's attempt at a gnarly trick draws stares because the athlete is a sight to behold, wheeling around the unassuming skate park in northern Spain having just turned...