Kettlebell exercises. Easy way to burn 300 calories in 15 minutes.
I don't have one of these but I am thinking about making one of these out of a milk jug and putting rice or sand inside of it. Then I can add the amounts until I get it to where I can handle more and more weight as I get stronger.
Or possibly one of the BIG drink cups you get in the summer. I have several I have picked up at garage sales that we never seemed to ever use.