Hevy also works with the iPhone and Apple Watch, and of course you can use it just on a phone. These devices, typically watches, allow you to see how many steps you’re walking throughout the day. Most can also track your heart rate to give you an even better idea of how many calories you’re burning as you work toward your fitness goals. The ability to find entire workout programs and add one-on-one personal training means Fitbit Premium is likely to be popular for those who want a more guided and hands-on approach.If you want to get more out of…