• Physical activity: "Any bodily movement ► ↗ Energy expenditure" (Margaritis): mounting stairs, walking ... • physical exercise, a subset of physical activity: planned, structured and repetitive: jogging, weightlifting ... • From 2006: promotion of AP in smokers: "its advantages similar to those of other aids" ( 2009: the regular AP = predictor of abstinence; ¼ of the smokers move at the start of ST(磨蚀剂)