Final answer:
The Mannequin Challenge was the viral fad in 2016 that involved people remaining motionless on camera.
Step-by-step explanation:
In 2016, a fad called the Mannequin Challenge went viral. This social media trend involved groups of people recording themselves frozen in place, like mannequins, often with a camera moving around them to showcase the various poses. The challenge was notable because it featured people being motionless, which stood in contrast to other activities that involve large amounts of screen time or sedentary behavior, such as watching TV or playing video games on devices like the Nintendo Wii, which had revolutionized gaming in 2006 by encouraging physical movement.