I am not happy with my phone defaulting to Live Photo. There should be a setting to turn this annoying program off.
To change the default "Live Photo", go to Settings > Camera > Preserve Settings, then turn on Camera Mode.
Preserve camera settings. You can preserve the last camera mode and photo filter settings you used so they’re not reset when you next open Camera. Go to Settings > Camera > Preserve Settings, then turn on Camera Mode. You can also preserve Live Photo settings on models that support Live Photos.
You would need a Mac with High Sierra to be able to extract a different photo as a still frame from a Live Photo. And (sorry) my memory has been faulty. Photos on El Capitan does not support Live Photos, you need at least Photos 2.0 on Sierra.
If you import your photos with Image Capture instead of Photos, you will see a video and a still frame for each Live Photo. If you import the video to Photos, you can save a single frame of the video as an image file. See How to Extract Still Frames from a Live Photo in Photos for Mac.