“Gaps in Our Knowledge” are discussed in the context of the need to integrate biological and behavioral factors in a biocultural approach to physical activity and movement proficiency. Specific issues considered include outdoor play, organized and informal activity, biological maturation, tracking of activity, development of movement proficiency, and individual differences. Studies considered are largely based on youth in economically better-off, developed countries in the western culture context. There is a need to extend studies of physical activity and movement proficiency to different cultural contexts.
Malina is with the Dept. of Kinesiology and Health Education, University of Texas at Austin, Austin, TX. Cumming is with the Sport, Health and Exercise Science Research Group, Dept. of Health, University of Bath, Bath, UK. Coelho e Silva is with the Faculty of Sport Science and Physical Education, University of Coimbra, Coimbra, Portugal.