Please choose the correct ending to complete the given sentence: Health: [header] How to help labor progress [title] Stay fit during pregnancy. [step] Making sure your body is in top physical condition before labor begins can reduce the likelihood of a prolonged labor. Preparing your body for what's to come can make labor easier and quicker when your baby arrives.

Ending1: Walk or swim regularly, and incorporate a few specialized exercises. [substeps] Kegels, small internal contractions of the pelvic muscles, can help your body with the pushing stage of labor and also reduce the risk of hemorrhoids in the weeks after childbirth. Ending2: For instance, if you have health problems after labor, it's likely you will need to consider strength training while you do them. [substeps] Ask your doctor whether strength training is safe for you to do while pregnant. Ending3: [substeps] Start with aerobic exercises that move your body and streamlines blood flow to keep your heart, muscles, and brain functional. Plan to take a few days off or take a weekend to relax before labor. Ending4: [substeps] Take just a few minutes for exercise before you start labor. A walk before labor starts can help you improve your posture, making it easier to feel supported and secure.

Answer format: ending1/ending2/ending3/ending4