I'm here to discuss motion in spacetime and how it works to hopefully get a better understanding of it. Specifically "spacetime swimming", and the motion of a "relativistic glider", which is talked about in this article "Surprises from General Relativity: "Swimming" in Spacetime" By Eduardo Guéron. Swimming Gliding so any information you guys can provide on this topic of how these two forms of motion work would be of great help. also besides any general information you can provide about it. i also have a few questions. 1. does "swimming" give the object/person a velocity? from my understanding of it and what i've researched swimming is completely different to motion on earth, and does not have acceleration or velocity involved. it is simply a translation of the centre of mass resulting in change of displacement in relation to other bodies of mass. 2. how does gliding work specifically? upon research gliding only works in conjunction with utilization of the gravitation pull of lagrange points 4 or 5. where the object gliding enters the orbit of the points L4 or L5 and uses that gravitation pull to slow its descent caused by the gravitation pull of the planet. 3. What effect does rotating have on a body of mass? gliding works via the spaceship rotating (changing its orientation) which in when in spacetime curvature will cause the centre of mass to move as well? but what sort of motion does this put on the spaceship? any information you guys can provide would be of great assistance in helping to further my understanding of motion in spacetime. thanks.