I'm mediocre to downright terrible at most sports, but I can dance. I also know several aspie women who can dance well. I know an aspie guy who is "very obviously" aspie (no eye contact, funny voice) who runs cross-country. I also know an autistic guy who is working towards a boxing marathon world record (hitting a punchbag) partly for the sheer challenge of it, and partially to raise money for an autism organisation. One of my aspie friends roller-skates to work every day. Oh, and I know a very awkward plump aspie guy who plays soccer.
I think it's a matter of finding that one form of exercise that works for you, and that's easier said than done, I think. If you do some sensory profiling, you will usually find what you need to make you feel good, e.g. whether you would dowell with impact sports, or something involving weights, or some form of movement which gives your vestibular system a bit of excitement, etc. -- everyone's different.
I like rowing a little boat on calm water and I get ecstatic from dancing, and I like swinging on the overhead and vertical poles in an airport shuttle bus (people stare; I don't care). I also dance as I walk in many places (e.g. in a shopping centre), doing ballet movements with my arms. Besides that, I don't like sport.
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When I must wait in a queue, I dance. Classified as an aspie with ADHD on 31 March 2009 at the age of 43.