This breathing technique is extremely effective in helping you to gain a sense of control in situations where you feel anxious and/or stressed. One of the great benefits is that it is so discreet and can be carried out without attracting unwanted attention, which is the last thing we need when we are in or heading towards panic mode. All you have to do is take 4 deep breaths in (in through the nose and out through the nose), hold your breath for 7 seconds and then breathe out deeply and slowly for 8 seconds. It is advised that this cycle is not repeated more than 4 times although it can be built up with regular practice. I was initially very sceptical about something so simple but have used it on many occasions and it has always successfully managed to get my breathing back under control which calms rising anxiety levels. There are lots of demonstration videos on YouTube and I would highly recommend looking at them. This exercise is a very simple yoga technique but one of the best I have found.