Same, except I tutored football players. They would need help with Calculus or Linear Algebra, but I would start them literally at arithmetic. Not kidding. Then I would test their knowledge and walk up until I found the exact place that their understanding went from "complete mastery" to "some gaps." This was often around algebra, pre-calc, or geometry. Then I would fill in that pothole, and everything else would snap into place!
It felt like this:
https://youtu.be/jChiI15Iwa4