Jessica Simpson Wearing a Black Dress

No days off! Jessica Simpson lost 100 pounds six months after she welcomed her daughter Birdie, and now, her trainer, Harley Pasternak, revealed how she made it happen. It turns out, Jessica wasted no time from when she gave birth to when she began working out. Based on what he said, consistency and dedication is what it’s all about.

“Shortly after she gave birth, as soon as we got medical clearance to start walking, we had a daily step goal on her Fitbit,” Harley, who has been Jess’ trainer for 13 years, told Us Weekly. “More of a limit if anything because we didn’t want to do too much.” Jess began her fitness journey by trying to walk 6,000 steps (2 miles) a day. Over time, the amount of daily steps increased “to 8,000 to 10,000, eventually to 12,000 and sometimes she even did 14,000 steps a day,” according to Harley.

To stay motivated, Jess stayed in communication with her trainer every day. “We had a nightly email [check-in],” Harley added. “And so my clients, before they go to bed at night, send me an email and it says, Did you hit your step goal? Yes or no? Did you hit your sleep goal? Yes or no? Did you hit your unplugged goal? Yes or no? Did you hit your food goal? Yes or no? To the extent that you check yes, it gives you this sense of accomplishment at the end of every day.”

Jess obviously accomplished a lot, and she couldn’t feel prouder! The singer took to her Instagram on September 24 to share the exciting news. “Six months. 100 pounds down. (Yes, I tipped the scales at 240 [pounds]),” she captioned the photo of herself wearing a dress. “My first trip away from #BIRDIEMAE and [I’m] emotional for many reasons, but so proud to feel like myself again. Even when it felt impossible, I chose to work harder.”

A few days after, a source exclusively divulged to Life & Style that Jess previously had a hard time accepting her appearance, but those days are long gone. “Jessica was very insecure with her pregnancy weight gain,” the insider said. “Having Birdie was unexpected and the pregnancy was hard, but she has been enjoying her family so much.” Congrats, girl!