Hello. I recently began practicing CO2 Tables, and I just wanted to share what helped me hold my breath much longer. Well, before I tried this my PB was a measly 2:30. As I began another hold I laid my hand across my chest. And, I just kind of randomly started counting my heartbeats. It took my mind off of thinking about how long I had been holding my breath, which would often cause my heart rate to go up and the contractions to begin. Anyways, I notice that counting my heartbeats really increased my ability to stay calm. After I just two tries I reached my new PB of 3:30. I'm sure I'm not the only one to do this, but I just thought you guys might give it a try. I've only been doing CO2 tables for about a week or two, btw, so I'm not very advanced.