You're on a freediving forum, the answer has to be freediving. Or even in your situation, dry apnea.
If you were on a fitness forum asking about lung capacity and breathing routines to help your fitness/endurance/running whatever, they'd be saying run.
Here is my point of view with fitness and freediving and my weekly routine:
I cycle upto 100miles a week, half is anearobic[fast/slow]. The other half is just for distance. I have never had a lactic problem in my legs whilst finning and this might be because of this.
I swim a minimum of three times a week, two of them are anearobic/intervals and based on butterfly and breast stroke. The other swim is pure distance but sometimes I breathe less. So if I do 500m I'll breathe every 3 strokes, then 4 etc so i'm improving lung capacity. I've been working a hell of a lot on technique under water and even have an instructor to help me with nothing but under water efficiency.
I started running again 3 weeks ago due to ligament damage and use to be sub20minute 5k runner, even on triathlons. I just run for distance but am thinking of including apnea runs in to my routine.
Other than this, I do yoga a few times a week, meditate a couple of times and do press ups, pull ups and planks etc at home.
I went a few months without doing any wet freediving/apnea because of my job/location/injury and recently got back in to it.. I've been doing it weekly now for over a month and I was back at square one after having my last few diving sessions in April and June with other freedivers. I do co2/o2 tables at home a couple of times a week too.
To conclude, if I just did freediving, once/twice a week with buddies and added to that, dry apnea, such as tables and swam on days I couldn't freedive, I think my breathe hold would be in a better position than it currently is. My max is 4minutes 50seconds and when I did that I wasn't at my fittest like I was a year ago and today. This was around January of this year.
I have gone about it like this: (I've been freediving roughly one year now)I was already very fit when I started freediving so just concentrated on learning/doing as much freediving/water/breathing stuff as possible in the first few months up to March of this year when I had a competition in Liverpool. Nearly everything after that has just been fitness and technique (I naturally go through phases). I'm now trying to combine both the freediving routine and my fitness and will be adjusting both over the next 4 months until the comp again. From there I will evaluate to see how good my routines have been and where I can amend. I'm a methodical person but will also say that other routines where people don't keep fit but constantly do more breathe holds will work for them better than this will for me.
I'd say go and get wet first and foremost, thats one of the main reasons every one dives? Hold your breathe in a safe environment and smile until you can start training with someone.
This whole post has lead to more questions I think than answers, just how I like it
and breathe!
