Why a strafing target is hard
A target moving in a straight line is a tracking problem: match its speed and stay on it. A strafing target keeps reversing, so you are tracking and then reacting to each change of direction. Every reversal is a small reaction test inside a tracking task, and the moment right after it is when most shots miss.
What the Strafe mode trains
AimBetween's Strafe mode puts one target on a side-to-side path with random changes of direction. You click it, it jumps to a new spot, and you pick it up again. That trains three things at once: following the movement, catching the reversals, and re-acquiring a target that has just moved.
Where it shows up
Most shooters reward strafing, because a sideways-moving player is harder to hit, so hitting strafing targets is a skill every game asks for. It is especially central in FiveM, where gunfights are largely strafe fights; the FiveM strafe training guide builds a routine around it.
How to aim at a strafing target
Match the target's speed rather than chasing it. A crosshair that trails behind and keeps catching up spends most of the round just off the target.
Watch the target, not your crosshair. The reversal starts in the target's movement a moment before it shows up as a gap, and your eyes can only catch that if they are on it.
When it reverses, do not throw the crosshair after it. A big correction usually carries past the target in the new direction and needs a correction of its own. A smaller move that lets the target come back into the crosshair costs less time.