This bag is good for learning to throw punches at a moving target and use your footwork. It is slower than a cobra bag because the spring is at the bottom, so if you want a fast bag don't get this one. I filled the base with water and it is about 40 lbs., light enough to move but still stays in place. I don't hit this bag that hard because that's not what it's for. If I really smack it, the base will rock. Not for heavy hitting. But it would be a good addition to your gym if you want to have different bags for different purposes.
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