Working a boxing bag is a great way to improve your coordination, burn calories, and improve your punches. With a decent punch sensor, you will have an easier time tracking your progress. The Aqua Training Bag Sensor is worth a look. It pairs to your phone to measure punch force, strike frequency, calories, and hardest punch.
This particular sensor is made for Aqua bags. After each workout, you will be able to see round by round analytics and view your past workouts.[where to get it]