Almost all circuit workouts will engage the entire body, and it's not all about strength training. Even though it's short, expect some tough moments throughout the workout when your lungs are on fire and your muscles are quivering from fatigue.
Besides feeling fit, there are some nice side benefits as well. Circuit training, when done right, will throw your metabolism into overdrive and burn tons of calories. Also, if you're bored with your current workout routine, circuit training can provide some fun and challenging variety.