Ribbon dancing

Make your own ribbon hoops (if you don't already have some)

you can use curtain loops, bracelets, you can even cut up a toilet roll to make a loop

This is great for encouraging large arm movements, and the ribbon hoops also look lovely hung outside to blow in the breeze afterwards.  

You can use as many or as few ribbons as you like.  If you can't get any ribbons see if there's any old material you can find to tear into strips or maybe cut some plastic bags into strips.