Strength training provides different health benefits than aerobic exercise, and is important even if you don't want to "bulk up": http://www.everydayhealth.com/

Strength training provides different health benefits than aerobic exercise, and is important even if you don't want to "bulk up": http://www.everydayhealth.com/fitness/add-strength-training-to-your-workout.aspx http://www.everydayhealth.com/fitness/add-strength-training-... And weight lifting is one of the most effective ways to develop strength.