Please choose the correct ending to complete the given sentence: Health: [header] How to stretch your neck [title] Consult a doctor for serious injuries. [step] If you injured your neck in an accident, or if your symptoms extend to your arm, visit a doctor before stretching. If you have additional symptoms, check the warnings section below for more advice.

Ending1: [title] Visit a neoprene or rubber band retailer. [step] Traditional neoprene necklaces, belts, hats, and moleskin bands are all useful for stretching out your neck and relieving problems. Ending2: [substeps] For a less serious injury, gentle exercise is probably more effective than rest. As a general rule, stretching is a good idea as long as it doesn't hurt. Ending3: [title] Avoid stretching your neck for long stretches. [step] If you're stretched too quickly, you risk tears in your neck. Ending4: [substeps] If you have a back brace that will prevent you from moving, consult your doctor, or have a physical therapist help you. Heart problems, drugs, or lack of muscle strength could lead to a back strain.

Answer format: ending1/ending2/ending3/ending4