I joined a gym once. I didn't like it at all. They complained that I was wearing the wrong clothes, the exercise class was painful and difficult, I felt self-conscious in the body assessment... Wouldn't recommend it. If I didn't know how to swim and wanted to learn, I'd just take lessons.
What I can highly recommend is a Nia class. You can pay one class at a time, or for several classes at once. It is SOOOO not like gym. It is about ENJOYING movement, about doing movements that feel good and about learning your body's own way. You improve agility, balance, co-ordination, strength and suppleness in a class with others but at your own pace. Highly fit people and totally unfit people, super-supple and practically crippled, all can exercise together without feeling judged.
It includes elements of yoga, martial arts, dancing, and all sorts of other movement forms. The philosophy behind it is a good metaphor for body & mind and how they work together, IMO.
You can do it allk at home too.
Details at http://www.nianow.com
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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.