Alain Bernard, the French Olympic swimming champion, has decided to switch sponsors from Speedo to Arena. He will act as Arena’s spokesman from next Jan. 1 through the 2012 Olympic Games in London. The 25-year-old free-style specialist, who got a gold medal at the Beijing Olympics, will also become Arena’s No. 1 expert for the technical development of its future performance products. Two other high-caliber swimmers who distinguished themselves in Beijing, Cesar Cielo Filho from Brazil and Milorad Cavic from Serbia, have agreed to join the Arena Elite Team.