She'd heard about an international movement called No Excuse Mom, so about a year ago decided to start an offshoot in Whangarei, which spawned an online community of more than 100, some of whom meet for weekly workouts in parks around Whangarei.
"I've had a background in sports ... but no formal training," Ms Morgan said. "I took some formal advice [on how to run the group], and then you get in there and do it yourself."
Ms Morgan said the workouts range from a simple run to using toddlers as weights.
"We're just good mums who want to grow our confidence, self-esteem and we get out there and do it."
Mr Morgan said the women made a pact to enter a competition to get in the calendar, which involved 12 weeks of intensive training and setting up a photo with Little Lashes Photography, which donated the shoot. The best photos are selected by the calendar's organisers in the US, with the top 50 subject to online voting.
"It's pretty exciting, we never thought we'd actually get in there," Ms Morgan said. "We kind of used it as a motivation for the group to work towards."