This book shows how our movement changes throughout life. Significantly updated, Life Span Motor Development uses the model of constraints in discussing reasons for changes in movement throughout the life span. With greater emphasis on assessment than previous editions, it encourages students to examine how the interactions between the individual, environment and task bring about changes in a person's movements. The principles of motor development are presented in an accessible manner so that even readers with minimal movement science background will understand and appreciate the material. A key component of the sixth edition is an improved web study guide featuring revised lab activities and better functionality. This includes record sheets and questions which allow students to complete and submit them electronically, resulting in increased efficiency and reduced paperwork for instructors. There are also over 100 new video clips in the web study guide, including a comprehensive video diary of the motor development milestones in the first nine months of a baby's life.