People who want to make a positive change for their health and follow through with it generally have something in common: purpose. Looking for a free mini puzzle? Play the USA TODAY Quick Cross now.

Running with your child in a jogging stroller can be fun and empowering, but is it safe? The two of us are professors and biomechanics researchers interested in how running form affects injury risk.

"Faster, mommy, faster!" Allison's toddler squealed as she ran down the hill by her house with her jogging stroller. As a longtime runner and running biomechanics researcher, she found herself in the ...