hand gripper man squeezes rubber expander while working his laptop concept combining useful activity with necessary work

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Hand gripper. Man squeezes rubber expander while working on his laptop. Concept of combining useful activity with necessary work. Royalty Free Stock Photo

Hand gripper. Man squeezes rubber expander while working on his laptop. Concept of combining useful activity with necessary work.

Multi-colored mini training apparatus. Hand gripper. Man squeezes rubber expander while working on his laptop. Concept of combining useful activity with necessary work. Training hand and arm muscles.