|Description||A wonderful model for exercise that you can do at home is the HIIT or high intensity interval training model. Don't let the acronym scare you. HIIT means that you do 30 second intervals of exercises you choose, like your grade school calisthenics for example, for 10 minutes. Or if you are walking around the block you speed it up so that you are breathing deeply enough to make talking and breathing difficult. Evans and Burghardt call that increasing your physical activity, and perhaps you move eventually to something a little more formal like going to the YMCA and doing a physical workout.