Find some heavy cloth, like the stuff used for awnings. Sew a bag of it, use double or triple layers. Don't forget to add straps for it to hang from. fill with sand, or a mixture of sand and sawdust for lighter weight.
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A gym can buy boxing punch bags from various sources but would be best to purchase high end products that last longer from specialty stores. Some of those stores are Health Kart, Treadmill Factory and Fitness Superstore.
You can use a pillow or cushion as a punching bag. A punching bag is a great way of letting off steam and pent-up anger or frustration.
Share some basic punching bags drills that people can practice on their punching bags. For example, you could suggest combinations of jabs, crosses, hooks, and uppercuts that they can practice.