OREANDA-NEWS. June 15, 2016. Fitness trackers remain the go-to device for people who want to monitor their health and activities, but smartwatches are starting to up their game.

Among wearable owners who exercise, activity trackers are still more popular than smartwatches across most fitness-related categories, NPD Group said Monday. Their users are also more active, with 79 percent of activity tracker owners exercising regularly, compared with 66 percent of smartwatch owners.

However, the gap between the two types of wearables is beginning to narrow. Runners have become the first group to show a higher use of smartwatches over activity trackers. According to NPD, 22 percent of smartwatch owners run on a regular basis, versus 21 percent of activity tracker users.

Overall, wearable devices are growing in popularity as more consumers see value in them. Fitness trackers from companies such as Fitbit and Garmin have been outselling smartwatches. But smartwatches are starting to gain traction without cutting into the sales of fitness bands, indicating there's room for both types of devices.

Fitness trackers have generally focused on a few key activities and factors, such as heart rate, calories burned and steps taken. Some trackers have started to add more functions. But many smartwatches already offer more advanced health-related functions, such as running, yoga and pilates, and have gained ground among fitness-minded consumers.