The Australian actress, who is best known for playing Tess in TV show McLeod's Daughters, said that by the time she had second child Tobias nine months ago, she felt "better" about her body.
Carter told Woman's Day magazine: "I actually feel better about my body after my second pregnancy in a way, because I think I kind of knew what to expect a bit more. I knew that I would have a wobbly belly!
"[5-year-old son] Otis looked at my bum just after I had Toby and said, 'Mum, your bum's all wobbly!' in the most beautiful way and I said, 'That's because mummy has just had another baby.'
"Exercise is invaluable for my self-esteem, for my own wellbeing, for having time out and bonding with my children. There are so many benefits to it. I am also the kind of person who loves exercising - it gets me out of my head and into my body."