Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to prevent arm pain while driving a car [title] Stretch before driving and during breaks. [step] 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.

Ending1: [substeps] 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. Ending2: [title] Elevate your knees and feet. [step] Back bends can cause incontinence because your knees are more likely to squeeze the seat. Ending3: [substeps] While driving, it's helpful to stretch out your arms to the point where they feel flat, as this can prevent stiffness in your muscles. To stretch out your arms, you can stand up and move your legs out in front of you, or you can sit down on the floor or lean forward. Ending4: Wear a pair of quality, supportive support shoes. [substeps] To get the most circulation into your back, do some yoga poses as you stretch, such as cow's neck stretches, knee stretches, and donkey twists.

Answer format: ending1/ending2/ending3/ending4