Heylo. I'm 20. Nice to meet you
Jiggly stuff under arms. Hmm. I'm very much familiar with that! haha I'd like to know how to get rid of it too but you know, you can't just target one part of your body...that way you'd be like some picasso figure.
Anyway, you can still use some techniques to tone up certain areas of your body. Being on my quest to get Michelle Obama arms...I lift weights! and of course lots of cardio. Do some weight lifting, work those arms out and keep moving. Good luck~!