Wednesday, January 16, 2019
  • Welcome to the Forums, the largest online community dedicated to Freediving, Scuba Diving and Spearfishing. To gain full access to the Forums you must register for a free account. As a registered member you will be able to:

    • Join over 40,000+ fellow diving enthusiasts from around the world on this forum
    • Participate in and browse from over 496,000+ posts.
    • Communicate privately with other divers from around the world.
    • Post your own photos or view from 7,300+ user submitted images.
    • All this and much more...

    You can gain access to all this absolutely free when you register for an account, so sign up today!

Question CO2 and O2 tables question


New Member
Aug 18, 2018

I like to snorkel and explore underwater whenever I go on vacation and am really interested in upping my maximum breath hold time (which currently stands at a rather unimpressive 1:30). I had a question about practicing the CO2 and O2 there any danger in doing a table more often than a few times a week? Maybe like doing 5 tables a week. I saw a few other sites recommend no more than 3. All of my training will be dry training as I don't have access to a pool, so I just wanted to make sure that I wouldn't do my lungs or body any damage by doing them more often. It wouldn't be mentally taxing on me as I actually really enjoy doing the exercises. So again, is it safe to do more than 3 tables a week? And also is it even beneficial to do that?

And while I have you doing the tables, should I increase the breath hold portion if I'm getting through the 8 rounds fairly easily? Or should I stay where I started? For example, in the CO2 table, 50% of my PB is 45 seconds. On my first day of training (2 days ago), I did the 8 rounds of the CO2 tables quite easily. Is that how it should be or should I push myself at least a little bit? Say by maybe increasing the breath hold to 50 seconds?



New Member
Oct 23, 2018
Jacksonville, Florida
Good Afternoon Jim,

I know this has gone a long time unanswered but thought I would share what I know.

From what I have read doing breath hold training everyday can deplete your iron levels in your body which hemoglobin uses. I'm not sure if that really applies to doing a CO2 table everyday or if it aimed more at competition freedivers who might be doing breath holds all day long. I tend to think that holding your breath 8 times a day probably wouldn't have a big impact on your iron levels but I'm not an expert.

As far as the tables go you would want to increase your breath hold time and keep your recovery intervals at the same decreasing increment. Again I am not an expert but I like the very last hold to be a little challenging so if I finish a session and that wasn't the case I will bump my hold up by 5-10 seconds and see where that gets me.