Correspondence to

Which domains of childhood physical activity predict physical activity in adulthood? A 20-year prospective tracking study Verity Cleland,1,2 Terence Dwyer,3 Alison Venn1 Purpose It is important to examine how childhood physical activity is related to adult physical activity in order to best tailor physical activity-promotion strategies. The time- and resource-intensive nature of studies spanning childhood into adulthood means the understanding of physical activity trajectories over this time span is limited. This study aimed to determine whether childhood domain-specifi c physical activities predict domain-specifi c physical activity 20 years later in adulthood, and whether age and sex play a role in thes