Please choose the correct ending to complete the given sentence: Health: [header] How to burn more calories while walking [title] Take a hilly route. [step] One of the simplest ways to increase the intensity and total calorie burn of your walk is by walking over some hills. Work on finding a hilly route or using a treadmill and changing the incline to help you burn extra calories on your walk.

Ending1: [substeps] Try choosing a treadmill with a glide. For example, if you tend to walk on the sidewalks, you could get a treadmill with an on glide unit. Ending2: [title] Take a walking walk on the treadmill. [step] A walking walk (or a regular walk if you choose to walk) can help your body burn extra calories and work your legs, helping you walk higher. Ending3: Try taking a 15 minute walk for 30 minutes or 45 minutes over the course of an hour or two. [substeps] Try walking for one hour around a track, stationary bike or treadmill. Ending4: [substeps] Walking hills is a great aerobic exercise. It burns significantly more calories than walking on a flat surface and also specifically helps strengthen the back of your legs and glutes.

Answer format: ending1/ending2/ending3/ending4