The 37-year-old former Spice Girl, who welcomed baby girl Harper Seven last month, has launched a strict regime in order to get her pre-pregnancy figure back in time for New York Fashion Week, which kicks off on September 8.
And according to Now magazine, she has turned to Yogalosophy - a plan created by Jennifer Aniston's yoga instructor Mandy Ingber that works by aligning the body and mind, while also encouraging weight loss.
Her goal is said to be to reach a size-8, and the mum-of-four is apparently boosting her efforts using fitness DVDs now that her doctor has given her the go-ahead to exercise.