The Striiv Apex HR is a slim tracker, which monitors heart rate, steps, distance walked, calories burned and sleep around the clock. The device encourages users to set health and fitness goals, and measure their progress to see if they’re drinking enough water, or losing weight. Incoming calls, texts and notifications are displayed on the sleek screen. Despite being slim, the swim-proof device is built to last, with a battery life of up to 12 days and a built-in USB charger.