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How to prevent arm pain while driving a car
Stretch before driving and during breaks.
Stretching your muscles before driving will improve circulation and flexibility. You should stretch your back as well as your arms, since back strain and misalignment can cause arm pain.
Stretch your hands by extending your fingers and holding them outstretched for 10 seconds. Relax them, then bend your fingers at the knuckles, hold for 10 seconds, and repeat the sequence.