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.
Advanced techniques are used to boost the intensity of a workout, improve muscular endurance and shock your body to prevent a plateau. This kind of training can also enhance fat loss, and because it incorporates very little rest you also get some cardiovascular benefits.