At the core of Greek athletics was an individual's physical endeavor to overtake an opponent. For this reason, sports in ancient Greece generally excluded team competitions and performances aimed at setting records. Contests included footraces, the long jump, diskos and javelin throwing, wrestling, the pentathlon (a combination of these five events), boxing, the pankration (a combination of wrestling and boxing), horse races, and chariot races. During competition and training, athletes were usually naked and covered with olive oil to keep off the dust. They trained in the gymnasium or xystos (covered colonnade), often coached by past victors. The Greeks believed that their love for athletics, among other things, distinguished them from non-Greeks, and only Greek citizens were allowed to compete in the games.