Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to walk on your kneecaps [title] Sit with your legs outstretched. [step] You should be sitting on the floor with your legs straight and flat. Make sure there is something to grab in case you start to fall on your sides, and that there's nothing in your way.

Ending1: You don't need things on your side to grasp unless you are not experienced in doing this. You will need to build up your balance before you can walk without support. Ending2: [substeps] If you have trouble balancing on your legs, you could sit down in a chair. Make sure you are able to sit upright. Ending3: [substeps] A sling or a sliding deck is a great option for walking as you get closer to your hip height. [title] Flex your hips and lower your spine into a squat position. Ending4: If you like to fold or sit on your hands, you could do that. This works especially well in your home (your bedroom or playroom), where sitting is the highlight.

Answer format: ending1/ending2/ending3/ending4