Hand and wrist exercisers

Change resistance by varying distance between hands and/or by using a differentresistance bar
TWIST: with both hands on the bar, twist by flexing one wrist and extending the other
BEND: place both hands on or near the ends of the bar; keep your hands in positionand exert force to bend the bar
TWIST-N-BEND: combine Twist and Bend methods
SHAKE: place hand(s) at center or end, shake the bar
OSCILLATION: hold bar at center or end, move in circular motion; exercises work best with 36" bar

Please find more information here.