The authors studied the association of the type, amount, and intensity of physical activity with serum lipids in 2,492 randomly selected eastern Finnish men aged 42-60 years during 1984-1989, controlling for the major confounding factors. High density lipoprotein cholesterol (HDL cholesterol) and HDL2 cholesterol were associated positively and triglycerides inversely with total, occupational, and leisure time activity in a multivariate regression model (p