Okay this is a confusing sentence I came across in my learning software.
Nan ni kyoumi ga arimasu ka?
Let's simplify it by changing this question into a statement:
Jogingu ni kyoumi ga arimasu
Arimasu is used to express the existence of inanimate objects. "Interest" is an inanimate albeit abstract object, so it fits the description.
However, Ni is used to indicate the location of existence, and "Jogging" is the form of interest, not the location.
I know Ni has 6 other uses but applying those doesn't make sense either.