I love the "I have kids".  I had one lady, probably in her late forties, so her kids were older, getting dressed next to me at the gym.  This was about 3 months after I had my second.  She was eying me as I got changed.  She took her shirt off to get changed, grabbed her gut, and jokingly says to me, "wait until you have kids".  I responded "I have two, a 4 year old and a 6 month old".  WTF?  Having kids is not an excuse to carry around an extra 50-100 lbs for the rest of your life!