Motor Competence, Physical Fitness, Psychosocial, and Physical Activity Characteristics in 9- to 14-Year-Olds: Sex Differences and Age and Maturity Considerations. - Burton, Alan M.; Cowburn, Ian; Eisenmann, Joey C.; Sawczuk, Thomas; Watson, Thomas; McDermott, Jack; Till, Kevin (Research Quarterly for Exercise & Sport, 2025)