Missouri Botanical Garden "Gardening by the Month" tips and tasks for February 
http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/gardening-by-month/february.aspx

Exercises to Prepare for Gardening Season - Spring Training for Gardeners By Marie Iannotti
http://gardening.about.com/od/springinthegarden/a/Exercises.htm

Back Care Dos and Don'ts from an Orthopedic surgeon
http://www.hss.edu/physician-files/gonzalez/BACK-CARE.pdf