. . . a heart monitor that uses sensors woven into the fabric of underwear to warn people before they have a stroke; . . . new television reality shows likeThe Biggest Loser and Celebrity Fit Club, which promote exercise and . . . the CardioWest Total nutrition instead of drastic plastic surgery for weight loss;Artificial Heart, a new device for gravely ill patients that replaces the left and right ventricles; . . . Punk Rock Yoga, a “raw and organic” hatha-style class that meets in a nightclub and features live music, including easy-listening versions of punk classics;. . . an experimental nasal spray called PYY 3-36 for obesity that reportedly helps regulate appetite.