As a result, you might start to experience general symptoms such as anxiety, depression, negative mood states including anger or irritability, or stomach cramps and headaches. Relaxation is the process of turning-off the response to demand. Most relaxation exercises involve slowing down your breathing. This then changes the chemistry of your body and has a flow-on effect that generally calms the nervous system. The problem with the 'breathing-down' style of relaxation is that it irritates some people.
Some people find it difficult to concentrate.
Other people are very sensitive to increases of CO2 in their blood and get panicky. So, for some people the 'breathing-down' style is not a pleasant experience. It could be said that, if relaxation is not pleasant, then it's not really relaxation. An alternative method is to cause decreases in the amount of CO2 in your blood. I call this a 'breathing up' style of relaxation.