Breathing revisited

Here's an excercise for strengthening those out of practise stomach muscles and lungs. What i want you to do it sit near a clock, preferably an analogue clock - unless your digital watch counts the seconds it won't work. When the second hand reaches twelve, I want you to inhale as deep as you can, take in all the air to can in one swift breath and then hold it, as you watch the clock. Keep holding it until you absolutely cannot hold it anymore - now i really want you to work at this. Then let all that air out. Take not of where the second hand is on the clock. How long could you hold your breath for? 30 seconds? one minute? Take a few seconds to relax your self and get your breath back. Then when the second hand reaches the twelve again, I want you take inhale again and hold your breath. Your aim here is to hold it for longer than the first time but it doesn't matter the first few times if you can't. Once again, when you absolutely can't hold it in any longer, let it out. Take another few minutes and then do it one last time. I know it seems like a pointless excercise, but like I said it will strengthen all of those muscles and your lungs. If you do this everyday, you will get stronger as you find you can hold your breath longer. This will also help with phrasing, which I will move onto soon enough.