Does Greer Childers' "Body Flex" help firm up loose skin after losing weight?

I'm talking about 100 lbs plus weight loss. O

Does Greer Childers' "Body Flex" help firm up loose skin after losing weight?
I'm not sure about the exact video, but the problem with women's skin is that its not as elastic as mens so we get more stretch marks and also have softer skin. But with a significant weight loss such as yours, the skin may not be able to rebound from that or unstretch itself, I would consult with a plastic surgeon (usually the consultations free).