Arnason, A., Sigurdsson, S. B., & Gudmundsson, A. (2004). Physical fitness, injuries, and team performance in soccer. Medicine and Science in Sports and Exercise, 36, 278-285.
 Bergamin, M., Zanuso, S., & Alvar, B. A. (2012). Is water-based exercise training sufficient to improve physical fitness in the elderly? European review of Aging and Physical Activity, 9, 129-141.
 Bunce, D. (2001). The locus of age x health-related physical fitness interactions in serial choice responding as a function of task complexity: Central processing or motor function? Experimental Aging Research, 27, 103-122. http://dx.doi.org/10.1080/713842729
 Cuenca-Garcia, M., Jago, R., & Shield, J. P. H. (2012). How does physical activity and fitness influence glycaemic control in young people with Type 1 diabetes? Diabetic Medicine, 29, e369-e376.
 Granados, C., Izquierdo, M., & Ibanez, J. (2008). Effects of an entire season on physical fitness in elite female handball players. Medicine and Science in Sports and Exercise, 40, 351-361.
 Kang, H. S., Matsuo, T., & Suzuki, M. (2004). Effects of light resistance exercise using dumbbells and rubber band with mild energy restriction on body composition and physical fitness in obese Korean women. Asia Pacific Journal of Clinical Nutrition, 13, 242-247.
 Nagayama, H., Kimura, Y., & Shimada, M. (2008). Relationship between daily steps and physical fitness in community-dwelling eldery. Japanese Journal of Physical Fitness and Sports Medicine, 57, 151162. http://dx.doi.org/10.7600/jspfsm.57.151
 Martinez-Vizcaino, V. & Sanchez-Lopez, M. (2008). Relationship between physical activity and physical fitness in children and adolescents. Revista Espanola de Cardiologia, 61, 108-111.
 Teoman, N., Ozcan, A., & Acar, B. (2004). The effect of exercise on physical fitness and quality of life in postmenopausal women. Maturitas, 47, 71-77. http://dx.doi.org/10.1016/S0378-5122(03)00241-X
 Van der Hoek, F. D., Stuive, I., & Reinders-Messelink, H. A. (2012). Health-related physical fitness in Dutch children with developmental coordination disorder. Journal of Developmental and Behavioral Pediatrics, 33, 649-655.
 Yilmaz, I., Ergu, N., & Konukman, F. (2009). The effects of water exercises and swimming on physical fitness of children with mental retardation. Journal of Human Kinetics, 21, 105-111.