I only do two to three deep sort of rapid (20 seconds apart still keeping the exhale twice as long as the inhale to keep heart slow) breaths before a dive but don't extend the total dive time past 2 mins regardless of depth.
My depths are nothing impressive only between 30-60ft, but I have been to 75 and felt that another 5 feet would be easy enough.
I pack slightly maybe 3 times only during static land training, but avoid packing when diving. (i DONT LIKE THE TIGHTNESS IN MY CHEST THAT MAKES ME ANXIOUS and that might disturb my heart rhythm to much, because I am not used to packing; nor do I want to be+ I am in line with Jaque Mayol's thinking)
Last Saturday I dove and felt really alert just prior to diving, just breathing deeply and slowly but not hyperventilating, and not tingling, just alert, jfocusing more on evacuating my residual volume with deep exhales and normal inhales to near full volume. I think it had alot to do with the online Static apnea table exercises.
Some locals think if they hyperventilate they can stay down longer, but I know that is fooling with the return instinct too much for my tastes.
I do plan on experimenting with dynamic land training, sometimes when riding a Triathlon-Bike (because the posture from the bikes geometry facilitates an open chest and deeper than normal biking breathing) I pedal for 20 strokes in apnea then breath 5 deep slow breaths and pedal for 20 more till I can no longer prevent breathing heavily, then I go on with the ride for a mile or so and start over again. but I haven't done this in some time. I think I like the static apnea tables better.
jI do know that high Cardio workouts bring down the resting heart rate which is good for Free diving, but I also know 50 year old free divers who are literally fat and out of shape by normal standards, and who smoke and have a bottom time of 2 mins / 3 mins overall and down to 80+ feet spearfishing, But I bet if they were healthy they would impressive.
what do you guys recommend for dynamic land training?
I am preferring to save the training on the land, and let the improvements show in the water under relaxed conditions (keep in mind I am a recreational freediver/spearfisher)
I have been using the static apnea tables online from a UK website, and I think it is GREAT!! I am feeling more comfortable after doing only two sets the day before spearfishing! Thanks for the comments.
best of luck to you all and stay safe.
Scott in Saipan, AKA (TBGSUB)