Neymar Jr. (L) and Lionel Messi of FC Barcelona look on during a training session ahead of their UEFA Champions League Group C match against Celtic FC at Ciutat Esportiva of Sant Joan Despi on September 12, 2016 in Barcelona, Catalonia.
Brazilian diver Hugo Parisi shows off his tattoos of the Olympic rings and an outline of his native country during a training session ahead of the Beijing 2008 Olympic Games. REUTERS/Yves Herman (CHINA)
A fan shows his tattoo as he poses for a picture during a training session for Chile's national soccer team, ahead of the Copa America tournament in Santiago, June 8, 2015. Chile will play the group A matches along with Mexico, Ecuador and Bolivia in the upcoming Copa America 2015 in Chile. REUTERS/Ivan Alvarado