Blanche Betten, a 76-year-old retired restaurant owner, hammered Bob Warner, 85, with a flurry of punches, sending the World War II and Korean War veteran sprawling to the ground.

¡°Again, again, again,¡± onlooker Rosa Villanueva, 61, shouted at the Perris Hill Senior Center as Warner tried to regain his footing.

These seniors in San Bernardino, Calif., weren¡¯t fighting in a real ring. They were boxing on Nintendo Co.¡¯s Wii game console as part of a public-health class to encourage physical activity. They¡¯re among a growing number of former nongamers who have taken up the Wii and made it the dominant player in the $21 billion U.S. video game industry.