If their intent is to work me up to five minutes - great. As written, the app congratulates me after 40s and says, "Congratulations. You have good lung capacity." If I were only able to hold my breath for 40s I would be deeply concerned and not congratulating myself.

My take on their message, "Hey, we're making an app that helps boost your health with quick 5-minute activities." is that I'd receive something like a meditation + breathwork + gratitude journaling app which, in sum, accounts for five minutes of activity, not that their intent was to increase my lung capacity to five minutes.