Shapeheart: Heart Rate Monitoring Armband

What’s better than a regular workout armband for your smartphone? Maybe one that can also measure your heart rate. Shapeheart is a magnetic smartphone case that lets you access your apps and monitor your performance as you push your body.

Shapeheart should work with most smartphones and top running apps such as Strava and Endomondo. Its optical sensor has a battery that lasts up to 25 hours. The armband is adjustable and accommodates phones from 4″ to 6.2″.