Interesting about the nose clip interfering with proper breathing. After a year of intense practice/drills, I feel like I have finally mastered TI. I now look forward to swimming. The only missing part is being able to swim beyond 100 meters without stopping because I'm out of breath. I breathe relaxed and every 3rd stroke. I now suspect, because of this thread, that my nose clip is to blame. Based on others experience, its seems that I need to breathe out nose and mouth to completely empty the lungs. I will start tomorrow without the nose clip and see if there is improvement.