What does "lining up jumps" mean here?
"The real sickness-inducing problem, for me, was sidestepping. Every time I'd strafe to the left or right in Dying Light's VR, I'd feel a little lurch in my stomach. Trust me, you don't really notice how often you sidestep in first-person games until you feel it in your stomach every single time it happens. Angling around corners, lining up jumps, and avoiding enemies all became things my stmach learned to fear in virtual reality much more than the attacking zombies. I found myself having to take a quick break every five or ten minutes to get some air and some water just to settle my stomach before continuing."
From Ars Technica, "Virtual letdown: Dying Light shows the difficulties of first-person VR",
http://arstechnica.com/gaming/2015/02/virtual-letdown-dying-light-shows-the-difficulties-of-first-person-vr/