By Laurel Morales
Flagstaff, AZ – On a recent sunny morning a pack of moms push jogging strollers single file up a hill in Flagstaff's Buffalo Park. The toddlers belted into beefy strollers smile as the wind rushes past them. The moms - not all of them smiling -- are there to work.
SABOL: Tighten those gluts. Up the hill let's go.
Beth Sabol teaches the stroller fitness class.
SABOL: Push it! Push it!
Sabol's daughter Lily naps in her stroller while her mom shouts commands.