I'll tell you a secret - just have kids.
ANd I am not the only one saying this. My single friend can vouch for that statement as well because she's seen it with her two eyes (or 4 cos she wears glasses). I was told that she met up with a classmate whom she hasn't met in ages and got the shockalingam out of her life. That classmate used to be or look like Joanne Kam PoPo. You'll have to google her if you don't know who I'm talking about. And apparently, after 3 kids, she looked like that Swedish nanny from Sex n The City 2. SLimmed down big time. The secret was...get this -- she lost all her weight as the babies came popping out.
Of course, I cannot verify the truth in what she's telling me because I've not met her friend but I can't think of any reason why she'd want to fabricate some stories. I believe her..wholeheartedly because it's happening to me. Rather, it has happened. You see, after giving birth to Ash, it took me 1 whole year before I could fit into my jeans. With lil Em however, it took only 6 months. So, now you know why I believed her story. And, I always say this and I won't hesitate to say it again - having kids are your best fat burners!