In the past few years, we have covered plenty of smart fitness trainers that combine with your smartphone to maximize your workouts. The Tergasy Spider Resistance Bands are also worth a look. They come with an iOS/Android app to track your workouts. You can use them to perform curls, rows, and other exercises to strengthen your body, build up stamina, and work your shoulders, arms, legs, and glutes.
The Spider Resistance Band has non-slip handles. It lasts up to 5 hours on a single charge. It comes with a heart rate sensor built-in.[where to get it]