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The Handmaster Plus Medium hand exerciser has received rave reviews as a modern training device for grip strength and performance in 1) sports like golf, tennis, hockey, football, baseball, basketball, gymnastics, martial arts, combat & MMA and extreme sports, 2) music pursuits such as guitar, piano, wind,and drums, 3) gamers and esports athletes and 4) ergonomics. The exerciser is also used in the treatment, rehabilitation and prevention of carpal tunnel syndrome, tennis elbow, osteoarthritis, osteoporosis, tendonitis, dequervain's syndrome, dupuytren's contracture, repetitive stress injury (RSI) and much more, under the approval of a health care professional. It is used to strengthen and balance the muscles of the finger, thumb, hand, wrist, carpal tunnel, forearm and elbow, as well as to improve healthy circulation.