Personally I've seen a lot of boxers and martial artists with this thing, it wasn't exact but the concept was the same. If you want to start improving your accuracy, accuracy and general hand-eye coordination then I recommend getting this article. Especially if you are just starting out or are a beginner. The level 1 ball is really easy and you can easily master it in about 2-3 days if you are consistent. A level 2 ball gets a little harder just because it's a lot heavier and heavier than a level 1 ball and again it takes time to get used to so you need to be consistent. All in all very helpful and useful for my study, so I strongly recommend you to get this!
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