I don't think the app is research backed. It once adviced me to diaphragmatic breath all the time even when I'm not meditating and that caused hyperventilation and diffculty swallowing for me. At first I didn't know what really caused them (thought it was stress or something) but lately I started to breath to my chest at a coincidence and I realized that they was caused by this stupid advice because they totally disappeard so don't apply everything they tell you if you care about your health