I joined because I'd finally got sick of being worried about whether I could attend social events because of the arms on chairs (trips to the cinema, theatre, restaurants, you name it). I was getting myself worked up about it and would constantly have to do a 'test run' first to see if I could fit, which was embarrassing as I'd have to tell the people at the place why i wanted to visit.
Also, I've always had low self esteem but now it was getting to the point where I'd be jealous of women on the TV when my OH was watching (eurovision springs to mind) and i realised that I felt so bad because of my size. I wanted my Oh to feel proud of me when we were out but surely he wouldn't do as I was just a sack of potatoes (he said I wasn't) - so I joined SW at a weight of 22 stones 7lbs (my heaviest ever) and have now lost 4 stones (so far)