Physical activity (PA), its location, social interactions and fundamental motor skills were investigated in four-year-old Finnish children in day care. Six skills in the stability, locomotor and manipulative domains were assessed in 53 children (24 boys, 29 girls, normal anthropometry) with the APM-Inventory manual for assessing children's perceptual and fundamental motor skills (Numminen, 1995) and Total Motor Scores (TMS; 0-6 points) calculated. PA intensity, location, group composition and activity type − sitting, squatting, kneeling − were directly observed with a modified version of the Observational System for Recording Physical Activity in Children-Preschool Version (OSRAC-P) (Brown et al. 2006) during three consecutive days in 14 centres.