Although meditation sitting is the classic practice for understanding breath and life itself, it's often easier to learn correct breathing while moving.
Swimming is a perfect example since easy movement in the water depends on breathing and relaxation .
And, physically trying harder doesn't get you as far. The following compares various forms of movement and sport and how breathing is addressed for each. Tai Chi breathing follows the same patterns as the movements. According to tai chi teachers, this breathing pattern enhances natural breathing, making it deeper and more even. The result is a deep sense of relaxation, increased flexibility and most importantly, wonderfully correct breathing.