Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to walk for exercise indoors [title] Start out easy. [step] If you are new to walking for exercise-especially if you are overweight or lead a sedentary lifestyle-it's important not to push yourself too hard when you first start walking indoors for exercise. For instance, walk only a mile or two (two to four kilometers).

Ending1: If you start out too slowly, you could be injured in several places, especially if you are overweight or lead a sedentary lifestyle. [substeps] Plant your small toe on a branch or branch that's not too close to your resting foot. Ending2: Be sure to slow down at first if you slow down and then step back up to the ground quickly. [substeps] Good practice is to start at a moderate speed for 30 minutes at a time, but then gradually increase speed gradually. Ending3: This way, you'll be able to build endurance and speed over time. [substeps] Before you begin walking, consult a doctor. Ending4: Remember that movement changes your body's natural mileage, in part because movement stimulates blood vessels for faster blood flow. [substeps] Instead of walking a long distance in a short amount of time-between 3-4 days-start with a shorter walk.

Answer format: ending1/ending2/ending3/ending4