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The wrist roller (earliest referred to as York Wrist Developer) is a device designed for strengthening the wrists together in a rolling-pulling motion. It consists of a bar of varying lengths, with a cord or rope attached, which the user rolls and unrolls. This is resisted by the weight of a mass at the bottom of the cord. Rolled and unrolled, it has a concentric and eccentric proportion. The muscles of either side of the wrist can be targeted by varying the hands' grip. It can even be performed (with lighter weights) manipulated by the fingertips to develop dexterity.

The length of the rope determines the length of time one will take to vary between the concentric and eccentric portions (though it will always be the same length, if rolled and unrolled at the same pace). Strength is built by using a larger weight. The focus on gripping muscles versus wrist extensor muscles can be varied based upon the thickness of the bar. Speed and explosiveness is obtained by rolling at faster paces, easier with lighter weights.

In addition to the rolling, there is also a function of wrist and shoulder supination inherent in the exercise, as one hand will hold and twist the weight, keeping the other side level, while the other lets go as to let it rotate and shift the grip. This is more apparent with heavier weights. Normally held in front of the body, this focus can be somewhat altered by the height/angle the bar is held at. Generally, straight in front of the body is ideal. This can be reversed by holding it behind the body from below or above, allowing a different focus of muscles as well as a prolonged stretch for flexibility and endurance.

• Mention in the York Handbalance Course
• Bodybuilding.com article on wrist roller exercise
• WannaBeBig article of the month, Wrist Rollers