How to switch apps on an iPhone 6s or 6s Plus without touching the home button

I usually switch apps using the "double-tap the home button to access the app switcher" on my iPhone shortcut, but recently learned that there's an easier way. 

Excuse me if you already know this one, but it was new to me (a few months ago) and most of the people I've shown it to have been surprised. Press and swipe from the left edge of the screen to switch to the next app.

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