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Switzerland. Canton Ticino. Tenero. Centro Sportivo Nazionale della Gioventù - Tenero (CST). Nationales Jugendsportzentrum Tenero. From left to right: Bastien Mouthon, Killian Imwinkelried, Alain Enz, Lucio Romero and Yanier Bello are training  under the rain. The 4 × 100 metres relay or sprint relay is an athletics track event run in lanes over one lap of the track with four runners completing 100 meters each. A relay baton is carried by each runner and must be passed within a 20 m changeover box (usually marked by yellow lines) which extends 10 m on either side of each 100 m mark of the race. 31.05.11 © 2011 Didier Ruef