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The only concern is you may develop a bad habit that you only punch with your arms without using your body. Any training that you only see arms move but don't see body move is not good.
That’s a good point if your training revolves around hitting that ball. As a supplementary tool like a warmup, cool down, or as a purely focus drill, I think it’s a great idea; it’s the first time I’ve seen it though.The only concern is you may develop a bad habit that you only punch with your arms without using your body. Any training that you only see arms move but don't see body move is not good.
It's more similar to a speed bag, you're not going to hit someone like you do a speed bag. It's to train reflexes and timing more than anything. Or as some guys in my gym use it for, hit it as hard, loud and fast as possible without form nor rhythm.