Allison Webb, 31,  a Stroller Strides instructor and a  mother, (middle) pushes her baby as she leads a group of moms through a power walk segment of a  50 minute  class along the Santa Monica Boardwalk on Wednesday May 31, 2006. Classes are designed to improve ones cardiovascular endurance,  strength and  flexibility. All  classes are taught by certified instructors, who are also moms.