I've had 4 kids, so this is my area of expertise Funny as it sounds you need a corset. If you wear a tight garment around your waist while you do cardio, or just sit in a sauna your skin will tighten up. I lived in mine after all my kids and my abs are awesome. There's also a lotion out there called trilastin, it's about $100 bucks a tube on ebay but it will increase your skins elasticity, which helps get rid of saggy skin too. Good luck

Depends on the severity. I personally have a lot of it with stretch marks becaue I was 300 lbs once jn my life. What I've noticed tho is as my abs have gotten stronger and thicker the skin has improved leaps and bounds over the years. Other then surgery I'm just going to try to continue to build my abs to help fill some of that skin back in. I look at as a sign of hard work , I just will never be able to get on a stage. So if yours isn't severe I would think as your abs get thicker and you get low body fat it will start to improve.

A gal of water dispersed throughout the day can help alot.

Well; here is the rule of thumb FOLO or First on Last off. it is a pain in the ass because I have the same problem. Just continue doing your routine and it will disappear; unless you were extremely overweight then you need surgery. It takes time for those problem areas to go away.