What treatment would get rid of the loose skin under my chin? (Photos)

I tried Ultherapy on my lower face and neck about 7 months ago (I consulted a plastic surgeon and that is what he recommended for me), however it didn't fix this like I was hoping for. I'm only 35 so was hoping there is something non-surgical and non-invasive that would get rid of this loose skin under my chin. I'm thin, fit and very active so this bothers me a lot since it's something I can't fix on my own. Any advice would be great!

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