Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to lunge a horse [title] Find an enclosed space for lunging, preferably a ring or small enclosed pasture. [step] Be sure that the footing is safe for your horse throughout the ring and that you can make a circle that is at least twenty meters in diameter. Do not work the horse on a tight circle for an extended period of time, as it can cause damage to their legs.

Ending1: [title] Start a lunge with a straight lunge, and using a strong jump, move forward with the lunge. [step] As you lunge, quickly swing your body away from the horse in the lunge. Ending2: Avoid bringing your horse to these places only for lunging, spend time doing activities to desensitize the horse to the new location. [title] Apply polo wraps or brushing boots to the horse before starting work. Ending3: [substeps] If you decide to use an enclosed space, then make sure that you clear the area and that your horse is comfortable as soon as possible. [title] Use abdominal muscles and rib cage muscles to lunge your horse. Ending4: [title] Lie down quietly on your back with your arms out out in front of you. [step] Do not do this with your horse's belly or legs, as this will cause injury.

Answer format: ending1/ending2/ending3/ending4