Learning to breathe properly can do wonders for your health and athletic performance. We have already covered plenty of iPhone breathing apps here. The OPUMP helps you take your breathing exercises to the next level. It is a smart gadget that measures your lung function with a MEMS thermal film hot sensor. It has an app that gives you access to various breathing exercises.
The OPUMP uses adjustable airflow resistance to work your respiratory muscles. It measures breathing volume and makes the data available on your phone. You will need to use this device for about 10 minutes daily to improve your lung function.[official site]