[tc328]

I recently purchased the D7200 and have been taking pictures of a moving subject continuously (my kids). I can?t get a decent focus picture. What am I doing wrong? I?m suspecting this is due to lighting as I?m shooting indoors but it is plenty bright with LED recessed lighting. Could it be that I?m using a prime lens (35mm)? I?m a beginner so any advice is appreciated.

Here?s what I have setup on the D7200:
AFC-S
Back button focus
ISO 800 to 1200+
F 1.8 (and higher)
Shutter (auto)

So I track my subject by holding down the back button with the center/crosshair aiming on my child?s face. I use the shutter button to take the photos as he/she moves around?.but 90% of the photos are blurry. What am I doing wrong?