The transition from 0 to 2 was quite easy and took just under a week and with every breathing session I felt stronger, better postured and more enduring. Week 2 through 4 was spent getting from level 2 to 3 and this proved quite a challenge. Level 2 was still quite easy, but 2.5 is where it got tough and the days rolled by without getting any further. I then began to add a relaxing mid-day run to the program, which quickly increased the distance and speed covered with every breathing session. Soon I was up to level 3 and this was the toughest challenge yet, but even this one shortly after became history. At 3.5 I was feeling stronger, faster and fitter than ever and with the 4 weeks up, I went back down to level 0 and started to incorporate some simple stretch and core stability exercises. Soon I was at 1.5 and still handling the extra load with ease. I moved back up to 3.5 on the normal breathing training but a very stubborn cold put a sudden stop to both my breathing and running sessions. I gave it everything I had, but level 3 proved too much. Turning it down to level 2.5 was easy at first, but when the cold hit my throat and lungs, I was back down to 2. The cold is now gone and I am gradually working my way back up again. - See more at: http://www.powerbreathebrasil.com.br/blog/josephine-gull-breathing-training-with-the-powerbreathe-starts-now#sthash.7Zjk7ChT.dpuf