Suzanne Moilanen has lived in six countries in the last 30 years. And while she enjoyed living abroad, it also allowed her to get complacent about her health.

“When you’re young and you live overseas, you don’t do well-woman exams every year,” she says, “and you kind of worry only about your kids’ health care needs.”

Then last summer, after she’d worked her way up to walking/running eight miles every day, her progress started...