Phi twirled her hair, "Well, in this case, we can't actually send our bodies to alternate realities, else it would cause a paradox. Rather, we send our consciousness (mind) to our alternate selves. We refer to this ability as jumping"
She cleared her throat.
"Oh boy, now you got her started…" Arche muttered.
Phi shot a glare at him and continued, "For coherency's sake, let's say the timeline we're in right now is Point A (starting point) and the timeline we want to travel to is Point B (destination)," she made gestures with her hands, showing the parallels, "The Point A version of myself will send my consciousness to the Point B version of myself. By doing this, we will switch minds; my Point A consciousness is now in the destination point, and Point B goes to the starting point."
Arche interjected, "Alright, so if I understand this right, "Point B" in this case is the destination timeline. And once your consciousness in THIS timeline, Point A, travels to the destination, Point B switches over here?" He scratched his head, desperately trying to follow her explanation.
Phi nodded, "Exactly. Though once I make the switch, my body in THIS timeline will go into a comatose state, as my Point B consciousness would now be inheriting my body, dormant. Until I return back to my respective timeline, my body here will be useless; an empty vessel, essentially."
(Okay, be completely honest, was that difficult to understand? I tried to make it as clear as possible, which isn't easy to do.)