Breath training is a great way to boost your stamina and improve your athletic performance. In the past few years, we have covered plenty of iPhone compatible breathing trainers and apps here. The ABLEFIT is also worth a look. It is an app connected breath trainer that you can take anywhere to practice. You will just use it for 5 minutes a day.
You can use the companion app to select a training program and game to guide you through breath training. ABLEFIT has 5 resistance levels for you to choose from. The app shows your breathing rate, lung capacity, and session duration.[where to get it]