Surprisingly the answer to your question is quite involved. I will answer it from a freedivers point of view. First of all, holding your breath has different effects depending on what circumstances you do it under. When you exercise normally your breath will increase as a response to the increased levels of CO2 in your blood.
February 14 is celebrated as St. Valentine's Day in various Christian denominations; it has, for example, the rank of 'commemoration' in the calendar of saints in the Anglican Communion. In addition, the feast day of Saint Valentine is also given in the calendar of saints of the Lutheran Church.
But hold up, you're not out of the woods quite yet; well, at least if you're in Japan. For most of us in the West, Valentine's Day ends on February 15, but in Japan it's not quite over until March 15. March 14 â exactly one month after Valentine's Day â is White Day in Japan. Valentine's Day In Japan To really understand what White Day is all about, you have to understand what Valentine's Day in Japan is like.