models like hillary rhoda have taken to social media to show off workouts. and a breakfast recipe of flax seed and acai powder. and candice, showed the bruised knuckles following the preshow boxing workout. ♪ >> reporter: but the secret many of us want to know, how do those model moms get back on the runway so soon after giving birth? surprisingly the secret for some isn't found at the gym on a treadmill or even lifting weights. some angels are simply taking a leap of faith. mary helen bower, a former dancer with the new york city ballet, trains clients using a low impact ballet-based fitness regiment. she spent a year working with natalie portman for academy award winning role in "black swan" and recently got victoria's secret model lily