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With age, the aged`s joints become inflexible and hard to bend, so they need
some training to make their joints more flexible.
Here is the product that design for old people, it looks like the dumbbell but
inside is empty, you can put some balls in the dumbbell. This product combines
with the principle of centrifugal force, when you shake the dumbbell, the balls
will keel over in the dumbbell, the rotation is more fast the centrifugal force is
more strong, then the body will drove by the centrifugal force.