No I got the confidence bit, you come across very calm, serine and confident in all of your posts, think you have hit the nail on the head about extending your types of friendship groups to include more men, on the gym front perhaps you could change to a more traditional type gym with some floorwork classes, and a swimming pool, Im sure that swimming exercise in gentle doses may be allowed. Perhaps you could let any really good friends know that if they have any single male friends you'd be interested in making new friends, but make sure you clearly state that you mean friends not dates to start with!
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Once lost but now found and happily married again!