A cheap hardwire device that I can take to the gym and not worry about breaking it. There are lot's of great workout tracking apps but I won't risk having my ex

A cheap hardwire device that I can take to the gym and not worry about breaking it. There are lot's of great workout tracking apps but I won't risk having my expensive smart phone smashed in order to record my workouts. I see more people using pen and paper even with all the amazing apps out there.