No Fall, Boots!

You can do that because your muscles are expanding against the ground—otherwise (in a frictionless system), your center of gravity would never change its velocity, whether zero or nonzero

First... this is false. If it were the case... no astronaut could move in space. Or bend their bodies.

it would be possible for an astronaut to walk in space, when they are not connected to anything.

No... because there's no Gravity pulling down. And there's no "ground" the fabrial is simulating.

You people know nothing about physics.

Get up... keep your legs straight and bend your torso forwards.

While bending forwards... the only force you exerted was downwards. The same direction OP's fabrial exert their force.

You don't need to push backwards in order to bend. Or to extend your leg forward. Just get up and fucking do it.

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