An Associated Press-LifeGoesStrong.com survey of 1,416 adults found that about one-third of baby boomers were obese, compared with about a quarter of younger and older adults. Although almost 60% of baby boomers said they were dieting to shed pounds, only about 25% said they engage in physical activity four to five times weekly and 37% said they never engage in strength training to prevent muscle loss. Although heart disease is the No. 1 killer, researchers found that it was No. 3 on the list of boomers' health fears, behind cancer and memory loss.