[fpernett]

Hi Pat

I don't know if I have the answer, but here is my opinion

I think that your DR in competition is due to stress, I think that a little bit of stress is not so bad, and can increase your DR.

It may sound stupid, but the best way to have a good DR is diving. I don't think too much in CO2, but in O2 stores to kick the diving reflex.

One exercise that I use to enhance DR is Murat-Style dynamics. Don't do any warm up. Start the dynamic as an static, if you have a heart rate monitor, your buddy can tell you when your heart rate have a good drop off, or feel your heart contractions and star the dynamic until you feel it very low.

Another way is by only training maximal dynamics without warm up. I think that if your body has to face an extreme oxygen depletion, it will use it an intelligent way (that's the main reason of the DR)