Please choose the correct ending to complete the given sentence: Health: [header] How to prevent leg cramps while pregnant [title] Stretch regularly. [step] Leg cramps are a sudden tightening of the muscles, which can cause intense pain. Stretching has been shown to be one of the most reliable ways of preventing or relieving leg cramping.

Ending1: [substeps] To stretch, first stand up straight. Place one leg behind you, and reach one arm out in front of you. Ending2: If you have diabetes or are naturally dehydrated, or if you are exercising frequently as part of your normal physical activity regimen, make an effort to stretch out your legs every day. [substeps] Sit on a flat surface and reach your hand to touch your leg. Ending3: Focus on stretches for your calves and feet, and make sure to stretch before bed, as well as before and after exercise. Avoid any stretches that require you to lay on your back. Ending4: Try stretching at least 30 minutes prior to getting pregnant : [substeps] Lie on your back on the floor with both knees directly under you. Use both hands to gently stretch your knee muscles, then raise your left knee as high as it will go.

Answer format: ending1/ending2/ending3/ending4