You may lie on your back, or you may lie face-down with your chin raised. Once you are inside the scanner, the machine's x-ray beam rotates around you. (Modern spiral scanners can perform the exam without stopping.) A computer creates separate images of the body area. These are called slices.
Circuit training builds muscular and cardiovascular endurance. It alternates intense cardiovascular activities, such as jumping rope and running, with strength-training activities, such as pushups, crunches and squats. With circuit training, you can focus on building endurance for a specific muscle group or your entire body, depending on the strength-training exercise you choose.
To help increase your good cholesterol levels, you need to work out regularly. The American Heart Association recommends that adults should do at least 30 minutes of moderate-intensity cardiovascular activity for at least five days per week.