No instructions - do not buy
Not user friendly as instructions are inadequate. Regret buying.Stinks
I agree with the criticism that there is no instruction. The "instructions" section is really a disclaimer that provides no guidance on how to perform the exercises. I can hold my breath and look at my watch for free.Should be free - do not waste your money
This app comes with zero instructions on how to use, so unless you are familiar with apnea breathing techniques and terminology, this app is worthless. At its best, its a basic glorified timer, and the app offers nothing that a regular stopwatch/tracker app can't do. Don't waste your money on this, I'm sorry that I did.