In this 2012 photo provided by courtesy of Stroller Hikes, mothers with 

In this 2012 photo provided by courtesy of Stroller Hikes, mothers with their babies and toddlers come out for a fast-paced Stroller Hike on the Park Perimeter Loop at Sunnyvale Baylands Park, in Sunnyvale, Calif.  All Stroller Hikes are free and open to the public throughout the San Francisco Bay Area. (AP Photo/Courtesy Stroller Hikes, Debbie Frazier)
Associated Press
In this 2012 photo provided by courtesy of Stroller Hikes, mothers with their babies and toddlers come out for a fast-paced Stroller Hike on the Park Perimeter Loop at Sunnyvale Baylands Park, in Sunnyvale, Calif. All Stroller Hikes are free and open to the public throughout the San Francisco Bay Area. (AP Photo/Courtesy Stroller Hikes, Debbie Frazier)
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