Is there a way to see what is running in the background w/o adding an App?

I have a Moto Z Force running recent Android 7.0. I bought the phone in Dec. 2016 so I've had it a couple months. It seems like now I'm not getting the same incredible battery life I used to get. I'm wondering if I have a bunch of apps running in the background & how I can stop them? I've turned the phone off several time & it doesn't seem to help. I think there are apps & services that are triggered to act from the background without my control. For instance.
-When I go on walks the Map App...

Is there a way to see what is running in the background w/o adding an App?

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