Pollakoff plays tennis twice a week, but he engages in virtual tennis matches as well. The popular Nintendo Wii game system lets players mimic the motions of sports like tennis, baseball, bowling, and boxing without leaving their living rooms. "As entertaining as it is for children," Pollakoff says, "I think it is so very important for seniors because instead of becoming poster boys and girls for couch potatoes it gets them moving about." Various game systems, including Nintendo's handheld GameBoy DS, have also introduced games like Brain Age
, which focuses on sharpening skills such as memory, word, calculation, and problem-solving, instead of just killing zombies and aliens.