Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a backbend against a wall [title] Find a good, clear spot. [step] Find a wall space that is clear of any obstructions such as furniture, plants or sharp objects. It should have nothing that could injure you near it.

Ending1: [title] Put your face or body against the wall. [step] Try to be as close to the wall as possible. Ending2: [title] Lift your left heel up slightly off the floor. [step] Hold this position for a count of four before lowering back down, with your left sole on the floor. Ending3: [title] Place a mat, cushion or pillow on the floor. [step] Or, use some other soft landing item to assist you should you fall or slip, such as a baby's mattress. Ending4: Also, it should have plenty of room to breathe without gaps and trapped air. [title] Do your backbend with your arms extended.

Answer format: ending1/ending2/ending3/ending4