Wearable computing devices are projected to explode in popularity over the next year and with a wave of new gadgets set to hit the consumer market, could soon become the norm for most people within five years. ABI Research forecasts the wearable computing device market will grow to 485 million annual device shipments by 2018.
Currently, sports and activity trackers account for the largest chunk of wearable technologies shipped today. Smart activity trackers are widely available, and the device’s trendy and stylish appearance makes them very popular with a broad range of customers. It is estimated 61% of the wearable technologies market is attributed to sport/activity trackers in 2013.
Via Olivier Janin
In addition, last year's ABI Research projections were that by 2017, 170M wearable wireless devices will be health and fitness related.
http://mobihealthnews.com/16415/by-2017-170m-wearable-wireless-health-and-fitness-devices/
This is a massive trend.