AA is generally the abbreviation for Associate of Arts degree. This is the degree given by many two-year colleges, often called Community Colleges (which used to be called Junior Colleges). Some also award the AS-- Associate in Science degree. Typically, an Associate's degree is the equivalent of a year, or in some cases a year and a half, of courses at a four-year college, and there are many students who transfer their Associate's degree credits so that they can complete a four-year degree.
Although it may seem difficult, lowering your breathing speed will help to lower your heart rate. Take a breath for 5-8 seconds, hold it for 3-5 seconds, and then exhale slowly for a count of 5-8 seconds.
The normal heart rate range is 60 to 100, with below 60 known as bradycardia and above 100 known as tachycardia. People who are conditioned or athletic are going to have a resting heart rate closer, if not lower, to 60. The heart is a muscle, so the better condition of the heart the lower the heart rate. The lower the heart rate will make it a little harder to achieve a higher heart rate zone which means the level of fitness is greater than someone that achieves their heart rate zone faster.