How the things work when your lifestyle is changed?

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Hi! How our everyday routine works if our lifestyle change? This is not just about changing anything here on earth, this is about the space traveller when they go to the space, a totally different type of environment, no gravity and floating is the only thing you can do there, u cant apply your effort to walk, to run or to move as this wont work over there. Then how they walk there in the space? Well, it is interesting. They use a leser torch, They have to flash the torch in the direction opposite to the direction they want to go, and then as a reaction of that thing they move from one place to the other. So how is that? Can u imagine you dont have control on yourself just need help frpm these all other things if u want to do something?