What am I?

I am quick when I’m thin. I am slow when I’m fat. Wind is my worst nightmare. What am I?

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I am lighter than air but a hundred people cannot lift me. Careful, I am fragile. What am I?

I have a leg but I do not move, A face but no expression, Be it wind or rain I stay outside. What am I?

Everyone is attracted to me and everybody falls for me. What am I?