Yogi, people who are widely known as a persons who develop unique capabilities within themselves, through intensive training. They can hold their breath for a much longer time, than a normal human does; they are able to control and stop the flow of the thoughts and ideas and in addition, they can demonstrate wonders of endurance, becoming insensitive to cold, hunger and high physical stress. They always retain calm and have an internal composure and self-control.

All of these qualities, to some extent, are essential for a freediver: perfection of the physical body, the highest degree of self-control, relaxation and concentration skills and the achievement of internal harmony.

Pranayama, the important aspect of yoga dedicated to the art of breathing has especial value for freedivers. By practicing these breathing techniques regularly you can not only increase the time of your apnea but also increase the sensitivity to the internal physiological and psychological processes of your body and mind, which helps you to learn to control them.
The first of freedivers, who discovered yoga and pranayama for his physical work out, was Jacques Mayol. In essence, the practices enabled him to reach a new level of understanding human interactions with the water element and attain new accomplishments.In nowadays, realizing the efficiency of yoga for freediving, many of professional freedivers include this practice into their daily routine.

However, Pranayama exercises are not the only aspect of yoga which can help you to prepare and warm-up your self before freediving. Here are the examples of basic San Salutation asanas, which you can use for a gentle stretching before the dive: 

Yoga