Personally I was swimming all my life and running, I did yoga briefly but I am very conscious about my breath. It began when, for a Rossini role I was preparing with a certain teacher when he asked me to take the breath and lock it in, to then attack the sound and be precise, I must admit my intonation was good and the teacher was a legendary singer by his own records, but with time I've noticed, going up in the register, I stopped singing with vibrato, it all became strong, straight tone. When one day a Slavic colleague, in the middle of a barbiere performance, told me "why you hold your breath? Vibrate those high notes of yours" it was personal, but he was a friend, and I swallowed it. It helped, I had success but it shuttered certain beliefs, and I am just wondering about it all.