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Every time you pick up a tennis ball to bend over the waist.
However, if you have tennis ball picker, it is easy. Tennis picker is lightweight plastic product that is attached with Velcro.
Put this product on a tennis racket, and press down and lift a ball, the ball will be attached to Velcro and you can pick it up.
Cheonan-si, South Korea
SEOUL, South Korea
Anyang-si, South Korea