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.