Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a dive [title] Start about four feet back from the end of the board if you're a teen or adult, or further if you take large steps. [step] Stand in an upright position, back and legs straight. [title] When you're ready to do your approach, take three long steps, swinging your arms, together, in the same direction, as you walk.

Ending1: [step] Keep your hips and back muscles as loose and tight as possible. [title] As soon as you're ready, do a 15-20 tumbling flicks with your arms and legs, keeping your elbows over your shoulders. Ending2: [title] When you're a teenager, complete three long steps, first, and then three slow steps. [step] If you are a teenager, place two fingers parallel with the edge of the board, just below where your stomach would rest. Ending3: [step] Repeat steps 3-4, going backwards of course, this is often enough walking. If you're a teenager, you should start slow and gradually work up to longer stride length walking, and jogging. Ending4: [title] When you've taken your three steps, bring one leg up and hop to the end of the board. [title] As you are doing this, keep your head and neck straight and looking forward.

Answer format: ending1/ending2/ending3/ending4