I have a masters in kinesiology....honestly, although I enjoyed it, it didn't help at all in my application process. I had a 4.0 in my masters, but I still got rejected the first round. They only put your masters GPA into overall GPA (and most masters degrees aren't a ton of credit hours that will balance out a whole 4 years of undergrad!). Generally, they will NOT even put these classes in the math/science GPAs and they certainly won't count them as pre reqs. In my experience, the pre req GPA is the most important, followed by math/science and overall GPA (depending on school of course). There are certainly other valid reasons to do a masters in kinesiology, but it will not solve a low GPA problem. And, it probably will cost a bit of $$ (more expensive than community college classes anyway).
Now, all the above said, the degree has been extremely helpful to me in PT school. Aside from my first semester (which was Anatomy and kicked my butt), all of my classes this semester have been mostly review for me.
Please feel free to PM me if you have more questions.