I can't grasp higher math concepts. I always failed it, all the way through the first year of high school. I was so thoroughly baffled by algebra that I got zero all year, and at the end, the teacher gave me 51 so I wouldn't have to take it again the next year. After Grade 9, math was an elective subject, and since I didn't have to take it, I didn't. I would have done even worse with calculus and trigonometry, if it were possible to do even worse! I don't even know what those things are. I've often wondered if I have dyscalculia.
I didn't do well at PE, either. Nobody ever explained the concept of sports to me and I never grasped it on my own. After elementary school, I didn't take any further PE classes. The PE teacher in high school was a stereotypical jock, with a mean streak a mile wide, and he took great pleasure in making an example of boys who were not sports-inclined. He had one poor kid stand up by the wall, while all the other boys threw medicine balls at his head. They broke his glasses and gave him a concussion. That was one kind of torture to which I was NOT going to subject myself!