I'm in 3rd year kin, and I'm actually doing a math minor, and it's helpful to have some basic math skill, but definitely not necessary.
As for math courses, a friend of mine in kin did not take grade 12 calculus, and was not required to take it for the program. They have phased this out now, so you will be required to take Math 1LS3 or 1A03.
The majority of the courses themselves do not require a lot of math. In first and second year, the two kin courses that include some math are research methods, and biomechanics. Some of the other courses use slight math knowledge, but that is more conceptual than anything else (for example, interpreting graphs).
It is definitely possible to be a kin student and not be great at math
If you have any other questions, feel free to ask!