Sia Cooper rocks 40-lb weight loss: 'Fit Mommy' blogger defends extreme pregnancy fitness

Sia Cooper is becoming a celebrity in the fitness world. On her YouTube channel, she's inspiring viewer with her 40-lb weight loss. But the "Fit Mom" blogger's health habits before having kids weren't so great. In fact, her diet and exercise lack were so spectacularly bad that she was showing signs of early aging. And it was looking 40 at 20 that spurred her to shed weight. Even with a two-year-old and eight months pregnant, Sia was thinner and in better shape than before having kids. Critics attacked the young mom saying she was hurting her baby with extreme pregnancy fitness. Just a few months after birthing the second baby, Cooper has shed baby weight in a healthy way. Here's how.   Sia Cooper rocks 40-lb weight loss: 'Fit Mommy' blogger defends extreme pregnancy fitness