Yoga exercises

Yoga on its entire concept, involves breathing and diaphragm training on all the exercises you can do. First of all, pranayama must only be teached by yoga trainers after a good work of the asanas, the yoga flexibility, body and mind control exercises. So, please if you´re seriously involved on achieve true goals on freediving, learn asanas, pranayama and meditation techniques like a whole thing. That´s true yoga...

Your teacher, a good teacher I hope, knows what could be better for you in order to learn those subjects:

Flexibility (the more your muscles and body are flexibles the less O2 they spend and your body moves more dinamically)

Breathing control (that´s obvious right? belly breathing, middle and upper, prana control through your body, controlled apneas, and so on..., bhandas to retain prana on your body, diaphragm stretches)

Mind control (mind-body control, meditation and relaxation exercises, right mind focussing..)

Asanas, Pranayama and Meditation... a typical 1 1/2 hour class works on this subjects

Progressively you could be learn more difficult exercises, but the most important thing is that you learn correctly basic exercises and to breath correctly doing them.