
By Mary Jane Irwin, Forbes.comAmericans are obsessed with their weight. Newsstands ("10 Hot Celebrity Diets!") and grocery aisles ("Low fat! Only 100 calories! Heart Healthy!") feed our pound fixation. Not to mention we're constantly reminded that our increasingly sedentary lifestyles are contributing to record ranks of overweight and obese citizens.Time for video games to take charge and get people off the couch.At least that's the hope of a new slew of games catering to a player's aspirations by providing a physical side to the hours spent plunked in front of a TV. It sounds counterintuitive but it's quite possible to work up a sweat playing "Wii Tennis," a game that replicates racket swinging with motion-sensing controllers -- there are...