"Another difficult challenge for you! (1) Like in your 3 minutes breath-hold, wearing the mask, hold your breath for 2 minutes, then take just one breath and carry on to 3 minutes, then just one breath and carry on to 4 minutes. (2) Then without the mask, seen from below like near the start of my "hard breath" video, go to 4 minutes as above, then just one more breath and go to 5 minutes. I think that is very hard! But if you can, take just one more breath and go to 6 minutes or more."