I always LOVED swinging, and I tend to rock back and forth when I'm upset or excited. The rocking, and complex body movements, too, are just a part of who and what I am!
Also, I do rock to try and calm myself when I'm very upset, too.
Hope this helped!
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An Asperger's man who has Autism Spectrum Disorder level 1- mild, with a sprinkling of Synesthesia.