Reurink, G., G. J. Goudswaard, J. L. Tol, J. A. Verhaar, A. Weir, and M. H. Moen. 2012. Therapeutic interventions for acute hamstring injuries: A systematic review. British Journal of Sports Medicine 46(2):103-109.
Reuter, I., S. Mehnert, P. Leone, M. Kaps, M. Oechsner, and M. Engelhardt. 2011. Effects of a flexibility and relaxation programme, walking, and nordic walking on Parkinson’s disease. Journal of Aging Research 2011:232473.
Safrit, M. J. 1990. The validity and reliability of fitness tests for children: A review. Pediatric Exercise Science 2:9-28.
Salminen, J. J., P. Maki, A. Oksanen, and J. Pentti. 1992. Spinal mobility and trunk muscle strength in 15-year-old schoolchildren with and without low-back-pain. Spine 17(4): 405-411.
Salminen, J. J., M. Erkintalo, M. Laine, and J. Pentti. 1995. Low-back-pain in the young: A prospective 3-year follow-up-study of subjects with and without low-back-pain. Spine 20(19):2101-2107.
Schwellnus, M. P., N. Drew, and M. Collins. 2008. Muscle cramping in athletes—risk factors, clinical assessment, and management. Clinics in Sports Medicine 27(1):183-194, ix-x.
Serbescu, C., D. Flora, I. Hantiu, D. Greene, C. L. Benhamou, and D. Courteix. 2006. Effect of a six-month training programme on the physical capacities of Romanian schoolchildren. Acta Paediatrica 95(10):1258-1265.
Sherman, K. J., D. C. Cherkin, J. Erro, D. L. Miglioretti, and R. A. Deyo. 2005. Comparing yoga, exercise, and a self-care book for chronic low back pain: A randomized, controlled trial. Annals of Internal Medicine 143(12):849-856.
Sherman, K. J., D. C. Cherkin, R. D. Wellman, A. J. Cook, R. J. Hawkes, K. Delaney, and R. A. Deyo. 2011. A randomized trial comparing yoga, stretching, and a self-care book for chronic low back pain. Archives of Internal Medicine 171(22):2019-2026.
Simic, L., N. Sarabon, and G. Markovic. 2012. Does pre-exercise static stretching inhibit maximal muscular performance? A meta-analytical review. Scandinavian Journal of Medicine and Science in Sports [Epub ahead of print].
Thacker, S. B., J. Gilchrist, D. F. Stroup, and C. D. Kimsey, Jr. 2004. The impact of stretching on sports injury risk: A systematic review of the literature. Medicine and Science in Sports and Exercise 36(3):371-378.
Tilbrook, H. E., H. Cox, C. E. Hewitt, A. R. Kang’ombe, L. H. Chuang, S. Jayakody, J. D. Aplin, A. Semlyen, A. Trewhela, I. Watt, and D. J. Torgerson. 2011. Yoga for chronic low back pain: A randomized trial. Annals of Internal Medicine 155(9):569-578.
Tremblay, M. S., M. Shields, M. Laviolette, C. L. Craig, I. Janssen, and S. C. Gorber. 2010. Fitness of Canadian children and youth: Results from the 2007-2009 Canadian Health Measures Survey. Health Reports 21(1):7-20.
Wang, C., J. P. Collet, and J. Lau. 2004. The effect of tai chi on health outcomes in patients with chronic conditions: A systematic review. Archives of Internal Medicine 164(5):493-501.
Welk, G. J., M. D. Meredith, M. Ihmels, and C. Seeger. 2010. Distribution of health-related physical fitness in Texas youth: A demographic and geographic analysis. Research Quarterly for Exercise and Sport 81(Suppl. 3):S6-S15.
Wilmore, J. H., and D. L. Costill. 1994. Physiology of sport and exercise. Champaign, IL: Human Kinetics Publishers.
Witvrouw, E., N. Mahieu, L. Danneels, and P. McNair. 2004. Stretching and injury prevention: An obscure relationship. Sports Medicine 34(7):443-449.
Wolf, J. M., K. L. Cameron, and B. D. Owens. 2011. Impact of joint laxity and hypermobility on the musculoskeletal system. Journal of the American Academy of Orthopaedic Surgeons 19(8):463-471.