Handmaster Hand Exerciser
It's not the first thing that comes to mind when I think of a Handmaster, but I dig what this banded ball brand of Handmaster has to offer too. Strengthening both the gripping and the expanding muscles of the fingers and hand through regular use, the tool has been shown to ease and prevent afflictions such as tennis elbow, osteoarthritis, tendonitis, and repetitive stress injury.
The Handmaster's complementary flex-extend exercises can also improve the technique and performance of those who have found that overgripping is ruining their game. Golfers. Cyclists. Weightlifters. Ladies. I mean, establishing a firm grasp to maintain control is important and all, but there's no need for white knuckles or a cessation of blood flow. The Handmaster trains balance, and balance makes a better execution.
Handmasters strengthen all 18 muscles of the hand, as well as stimulate blood flow. Their balls come in Soft, Medium, or Firm. There's a Goldilocks joke in there somewhere....