Hi!
Unfortunately, your trainer is right. You can not pick and choose where you lose the fat, you can only burn off as much as possible and hope that your most resistant areas eventually shrink down after you've lost it everywhere else. Depressing, I know.
The number fat cells you have is determined in early childhood, and once it's set, it's set for life. When we gain weight, we're not adding fat cells, we're plumping up the ones we already have, and if you have more fat cells around the belly than anywhere else, that's where it's gonna show more, and that's where it's gonna take the most time to get rid of. You can do all the abdominal exercises you want, and they WILL tighten and tone the abs so you hold them in better and stand with better posture, but they won't do a single thing for the fat. Only losing the weight will do that.
One other fabulous fact (not) is that once we ladies reach about 40, the hormonal changes in our bodies cause any fat we gain to be deposited first--guess where-- in the abdomen!!
The skin's another issue... between pregnancy and weight gain, once the skin is stretched, it's stretched, and if you've lost a lot then there's every probability that you'll have excess hanging there once the fat's not there to fill it out.
God, what a ray of sunshine I am this morning!

Sorry, I just don't want you to be operating under any misconceptions. It is just impossible to direct where the fat's going to disappear from, and you DO want to exercise to tighten up underneath it (and that alone will make it look like you've lost more than you have), but you're at the mercy of your genes as to how the fat will go away.
