hi all. I'm beginner in apnea. I knew extreme apnea since some days after getting this link. I havn't understand all the topics but I have learned about lung packing and buccal pumping. I use lung packing to the max to practice diving simulation in stairs. I have to buy a chronometer to get into other exercices. arousing happen when in simulated dives I'm going up in the stairs with tremendous contractions. At the end of the simulated ascent I get the feeling that if masturbate I will can hold many and many more contractions.