(Reuters Health) - - Negative childhood experiences in physical education (PE) classes may have long-term effects on adult physical activity, a large study suggests. Researchers conducted an online survey of more than 1,000 adults, ages 18 to 45, across 46 states about their best and worst memories of their PE experiences, as well as their attitude about physical activity now. The 392 male and 636 female respondents were recruited by an internet service for monetary compensation