Some predicted that smartwatches would swallow up fitness-tracking devices in 2015, but then a funny thing happened. They didn't. 

"Fitness devices are very simple and focused. They don't try to be all things to all people, and the prices are very reasonable," said Ramon Llamas, research director of wearables for IDC.

Credit: Fitbit
(Image credit: Fitbit)

Meanwhile, smartwatches are still going through growing pains as a category, mostly because device makers haven't made a strong enough case for what they do better than, or differently from, a smartphone.

In 2016, expect a body temperature-monitoring pill and smart shoes for fitness.

"Smartwatches are still trying to clarify their value proposition, but eventually we're going into a world where you have cellular connectivity and you'll be able to free yourself from your phone," IDC's Llamas said.

Credit: Jeremy Lips / Tom's Guide
(Image credit: Jeremy Lips / Tom's Guide)

When you lump fitness trackers and smartwatches together, more than 21 million units shipped in the third quarter of 2015, up from just 7 million the year before. Apple and Fitbit remain at the top.

MORE: The Biggest Tech Trends of 2016

Llamas argues that Android Wear has lagged behind Apple because its wearable OS isn't as open as its smartphone software, which has prevented vendors from differentiating their wares.

"Design and hardware features have been the only differentiation points," Llamas said. "The experiences are largely the same."

MORE: Best Smartwatches for Android and iOS

At CES 2016, expect a bigger push away from the wrist and toward everywhere else on your body. From a body temperature-monitoring pill to smart shoes for fitness, wearables will target more and more specific areas to deliver more nuanced information.

I think you're seeing those lines blur between fitness device and medical device. -- Shawn DuBravac, chief economist, CTA

In addition to tracking your activity and alerting you to smartphone notifications, wearables are also finding niches in specific health- and medical-related uses. This includes devices that are approved by the FDA, such as the ReliefBand for the drug-free treatment of nausea and vomiting associated with motion sickness. Another "FDA-cleared" gadget is LimiWave, which is an LED-powered pain relief device.

MORE: Best Fitness Trackers - Track Activity, Calories & Sleep

But many other device makers are touting health-benefit claims without FDA backing.

"I think you're seeing those lines blur between what's a fitness device and what's a medical device," said Shawn DuBravac, chief economist at the Consumer Technology Association. "That's a landscape we'll be navigating over the next couple of years."

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