Thoughts on Public Health minor? KINE classes?

I'm a Biology major and was thinking about adding a public health minor to my degree plan just so I could have more things that look good on my resume while raising my GPA. I asked the advisors of the PH minor about what classes they require and its mostly from the Kinesiology department and HEED. I'm currently a part-time junior as I cannot afford to work anything less than full time and currently am taking about 2 classes a semester but can bump it up to 3 if the courses aren't THAT heavy.

Not sure if anyone is in the minor or even how would minors work? If I decide halfway I don't want to do it can I just drop the minor? Are KINE classes hard? Are they mostly reading-based or math-based?