What is a good exercise plan to make my arms slimmer?

helpeeeee

New member
I have a dance coming up in about 3 weeks. I'm wearing a strapless dress and would like to make my arms more muscular.
I run or do some form of exercise everyday, but I don't do that much when it comes to toning (spelling?). I am definitely not overweight, but I certainly could not be considered a model.
 
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