One of the most basic and complete sets of asanas is the Rishikesh set. It provides flexibility in all directions, especially working the spine. Ask your yoga teachers to show you these asanas, probably most teachers are using these sets or similar variations.
There a lots of schools of yoga with thousands of asanas. Eventually once you have some practice one can also include repetitions and asanas specific to one's freediving needs.
That's for the body. The mind, being the headquaters of the body also has a very strong capacity to create lasting physiological changes. Heart rate changes, alpha waves, etc. So look into different types of meditation as well for deeper experiences and deeper diving. It will also help you improve your intuition, something which (as Eric Fattah has pointed out and emphasized in his world record description) is ABSOLUTELY necessary. Intuition has saved my life several times, as well as bringing me beautiful suprises, so it goes both ways, not only to get you out of trouble, but to make you aware of an opportunity that's unfolding at the moment - or in the future.
Adrian
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