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Step 1: Control How You Walk
If you're in a house - Its best to use socks, as they are soft and they are comfortably fitting. When on stairs or on wood floors walk 2-3 inches away from the wall for this will bring creaking to a minimum.If you happen to be without socks and on wood floors, your steps have to be slow where when you pick up your foot, the moisture on your feet is silent. Consider rolling your foot.
If you are changing from, concrete to grass for example, you could make a sudden rustling sound. The best thing to do instead would be to actually find the gaps in the grass and stand on them, if you can't do that, I suggest rolling, just take a nose dive right in there, why not?
If you're in a place with lots of grass or leaves, its best to use socks or bare feet in these places. If you prefer water-shoes. Like in the house, the socks and/or skin of your bare feet help the impact from your foot to the ground, to be dampened. If you're worried about wet feet you can use water-shoes, but with these you must be extra careful! If they are soaked they can emit a "squish" type sound as your foot hits the ground. If you don't want your feet to get cut on weeds or rocks, you can wear multiple pairs of socks too.
If you're in a rocky place (pebbles, gravel, etc.) - You must use either socks or bare feet. No shoes! Soft socks and bare feet cushion the impact, but shoes will push the stones down and out, making the sound of rocks moving. When walking on this type of ground, you must absorb the impact with your knees, which should be bent. Tread lightly. However, if you step on a piece of glass and need an emergency, it will be difficult to come up with an excuse.
If you're in a place with carpet or any material like that- its necessary to use bare feet. because of the carpet, any stepping will cause the carpet to make noise itself, and no matter what, you will make noise. In this environment it is best to just over-exaggerate your movements and move even slower. it can also be good to find a noise to cover yours such as a refrigerator's hum.