Circuit training is a combination of workouts designed to work every major muscle in your body. The quick switching between exercises gets your heart rate up higher than most other workout regimens, which in turn burns a lot more calories. Start a circuit training regimen to burn more calories faster and help lose weight. There are a number of good workouts you can include in a circuit session, but an example workout would look like this.  Burpees, three sets of 10. Read Do a Burpee for details on this technique. Squats, three sets of 10. Bench press, three sets of 10. Lunges, three sets of 10. Perform workouts fast to get your heart rate up to its max and burn the optimal amount of calories. Sprinting, unlike distance running, involves running as fast as you can for a short distance. This workout gets your heart rate up quickly and is an ideal workout to shed fat quickly. The explosive motion of sprinting will also sculpt your legs and abs, while simultaneously increasing your endurance and lung capacity. Follow these steps to perform a sprint workout.  Go to a track, or measure out a straight path of 100 yards. Warm up with either a jog or a brisk walk.  Stretch thoroughly after warming up. The explosive motion of sprinting can pull or even tear muscles if they're not properly stretched. Stretch for 10 minutes before your sprinting workout. Start at the beginning of the 100 yard (91.4 m) path and sprint to the end. If you are a beginner, don't start out with a true spring just yet — run at about 50% of your top speed to make sure your body is ready and you don't injure yourself. Then gradually increase your speed with subsequent sprints. Slowly walk back to the starting line. If you're still fatigued when you reach the start, rest until you feel up to sprinting again. Perform six to 10 sprints in a session. Repeat the training two to three times a week. Be sure to wear an athletic supporter, or at least tight-fitting underwear, while doing sprints. The quick motions can lead to a pulled groin or testicular...

TL;DR in Vietnamese:
Bắt đầu bài tập Circuit Training (bài tập xoay vòng theo chuỗi). Chạy nước rút. Bắt đầu tập rèn sức mạnh. Đa dạng hóa bài tập. Nhận thức về nguy cơ chấn thương tăng cao.