Updated: August 10, 2011
The Basics
Exercise: A Guide from the National Institute on Aging and NASA
Aerobic Exercise
Aerobic Exercise: Top 10 Reasons to Get Physical Mayo Clinic
Complications and Concerns
Asthma and Exercise Riley Hospital for Children
Core Exercises
Core Exercises: 7 Reasons to Strengthen Your Core Muscles Mayo Clinic
Exercise and Children
What if I Don't Like Sports? Nemours Foundation (also in Spanish) 
Exercise and Seniors
Exercise and Seniors American Academy of Family Physicians (also in Spanish)
Exercise and Teens
Consequences of Lack of Activity American Cancer Society
Playground and Sport Safety
Safety Tips for Home Playground Equipment American Academy of Pediatrics
Strength Training
Strength Training and Your Child Nemours Foundation (also in Spanish)
Stretching and Flexibility
About Stretching Exercises NASA / National Institute on Aging
Target Heart Rate
Tool: Target Heart Rate Calculator Mayo Clinic
