Aria does some exercise in a black top and panties, mostly jogging and jumping jacks.
Her boobs continually flop out over the top, and she'll periodically stop to put them back, after letting them bounce around loosely for a few seconds. Some stretches and lunges towards the end of the video.
She takes her top off to continue doing jumping jacks after a few minutes of holding and caressing her boobs. Once there's no top in the way, her boobs slap against her chest but when her arms are above her head, they bounce without slapping. She also does little bit of jogging in place - not enough to lift her boobs that high, but they still make a lot of noise.