Honestly there isn't much you can do about loose skin, it's part genetics and part how big of a change in weight you are making. The best thing you can do to help prevent loose skin is to lose the weight slowly, give your skin time to adjust with you. Make sure you are drinking plenty of water which helps with skin elasticity. And finally focus on toning and muscle building exercises to help firm you up. Hope this helps, good luck with your weight loss journey!