Kardashian uses son to stay fit

London: Reality TV star Kourtney Kardashian uses her 15-month-old son Mason to stay in shape."I take Mason on lots of walks. Carrying him around is like carrying 20lbs all day - when he was a baby I`d do squats while holding him," Kardashian told Look magazine.

The 31-year-old has been working hard to regain get back in shape since giving birth to her son, reports femalefirst.co.uk. "I started training to shock my body into doing something I`m not really used to - I`ve noticed a difference," she said. IANS