Many fitness buffs overlook the importance of grip strength. But a stronger grip translates to improved performance in sports from golf to judo, an ability to handle heavier loads in the weight room, and more easily performing almost any task that involves using your hands.
To work on your grip while you're driving, travel with hand grippers -- plastic handles connected by a coil that produces resistance. Squeeze the handles together for a certain number of repetitions -- try performing three sets of 20 repetitions. You can also perform isometric holds, in which you sustain the squeeze for several seconds at a time. Try squeezing for five to 10 seconds. If you don't have hand grippers, you can squeeze a rubber stress ball or simply grip the steering wheel as tightly as possible.
In addition to the compressing motion of using gripping devices, extending your fingers outward can improve your hand strength. Place a taut rubber band around your fingers to provide resistance and flare them outward.