There is some good info on skin tightening from T-Tapp, also a home workout that is very effective in reducing inches. They do skin brushing along with exercise and it seems to help.

Also on carbs - a couple of posts from Mark Sissons you might want for background. One is "chronic cardio," a discussion of what is going on with the body with an hour every day of cardio and then weights. Another is "what about low carb and high volume exercise." He advises adding carbs when you have more than an hour into intense exercise every day.

Google "chronic cardio" and "Primal compromises for athletes"

Sorry I can't give you personal experience because I would never do that much intensity every day, LOL, it's not exhilarating but just makes me feel wrung out. Doing intense sessions only 2-3 times a week feels much better, and low level activity all the rest of the time. Like playing croquet and badminton and walking.