Coursing Through is an achievement in Run 3.
The best choice would be the Pastafarian because her light bridge fills in the holes in the tunnel, meaning that if you avoid the slow conveyors, you can earn this easily.
If you don't have the Pastafarian, try the Runner or the Lizard. They work well here because of their great manueverability.
If you have the "Find more boxes in Infinite mode" upgrade, you can get better control by hitting a box, because that does not count as slowing down for the purposes of this achievement.