This video demonstrates how to make a punch bag. You will need a large duffle bag and a foam yoga mat. First, take your yoga mat and roll it up tightly. Place it upright inside your duffle bag and let expand, forming a lining inside. Next, fill your duffle bag with rags, clothes or any other soft material that you can use as a filler. Make sure that you fill your duffle bag up to the very top, when you've completed this make sure to pull the drawstring tightly and tie it off so nothing falls out when you are enjoying your new punch bag. Suspend it from a hook on a door or ceiling and start punching.