I commend you on wanting to avoid a hernia with preventative measures. They can be life threatening. Also, if you're into running and such, all that bouncing can help create one. I had my hernia repair break during my last run. Haven't run since, despite a subsequent repair.
An abdominal binder helps that area where the incision would have been made, where a Ventral Hernia could occur. There are products that may help you all the way down to the bikini line if your skin is starting to sag.
There is also the option of wearing a binder (or similar product from your local foundation store,) with a girdle-type pantie over it. I did that for a long time. Getting products at WalMart made it inexpensive enough that I could keep replacing them as my size dropped.
Shop around for good prices. I got a great device called ar SQUEEM f
om The BRA PATCH, a local store here in Raleigh, but I paid $65 for it. I love it because it's very fitted and thin like a subtle corset and I feel pretty wearing it. It doesn't have much give, which I think is a good thing. How useful is a binder if it just stretches to allow you to get bigger?
. This website has it for $45. The $75 version covers up a little more of your back and has straps to go over your arms. The back part hides any buldge up over the back of your bra. Note that it doesn't breath.
That may be a deal breaker for you. i didn't realize it when I bought it. This website has many categories to check out.
PS... the difference I noticed between a wrap and a corset is that a wrap is usually very thick velcro and very adjustable. It adds some bulk to you, but you can wear it longer during the weight loss process.
The corset is something I wouldn't buy without trying on
Try also googling ABDOMINAL BINDER, HERNIA BELT, or POST OPERATIVE SURGERY GIRDLE