In the past few years the wearables sector has been a hive of activity, but it feels like this year things have accelerated, particularly in the realm of health and wellness. A report by Forrester Research projected that 29 percent of Americans will use wearable devices, compared with 18 percent in 2015. It predicts that wearables sales will rise from $4.2 billion in 2015 to $9.8 billion in 2021.