Does anyone use baoding balls (chinese stress balls)?

I have been using baoding balls for a month now for 4-6 hours a day in both my hands. I have increased hand/eye coordination and a stronger grip and forearm. This is however my only benefits I have taken from using them. Has anyone that have used them for a longer period of time have any sort of positive health effects other than hand strength?

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Answer:
My father uses baoding balls and he says that besides an improvement in hand eye coordinaton and increased hand strength, he finds that it helps him relax his muscles and joints, relieves his stress and helps him get to sleep. He states that the bumps touch pressure points or acupuncture poitns all over the hand. He states that because they relax the muscles and joints, they prevent rheumatism and arthritis and stimulate blood circulation around your body, particularly the one with the small bumps on them. He states that the positive physical health effects will be seen eventually, but the physical health effects arent all that noticeable.

Hope this helps!

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Answer:
Well my father suffered from depression and that was one of the things that helped him get over it.