Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to do the corkscrew in pilates [title] Set up your mat. [step] Place your mat on a flat, smooth surface. Make sure that you set up in a quiet place, and in an area with enough space for movement.

Ending1: You can use a chair or a couch if you don't want your mat to be directly in front of you. Move along the mat, on the floor or on the balls of your feet so that you have room to move your arms and hands. Ending2: The mat should be approximately 6 inches (15 cm) from the ceiling and 6 feet (1.2 m) from any wall. Remember: pilates is a complex exercise, and stretching is not only for beginners, but it can help you build muscle. Ending3: Ideally, this will be away from people, or out in high traffic areas. [title] Lightly set your mat on the ground. Ending4: If you do not have a pilates mat, try doing the exercise on a carpeted area or use a towel. [substeps] Use a thicker mat if you have a sensitive back.

Answer format: ending1/ending2/ending3/ending4