
Around 20% of Smartphone users have one or more health apps on their device, the most common of which track physical activity or heart rate.
Wearable health trackers and Smartphone apps have taken the world by storm in recent years. Around 20% of Smartphone users have one or more health apps on their device, and a 2014 report by Nielsen found 1 in 6 of us use wearable technology - such as fitness trackers - on a daily basis.