Circuit training basically means... you’ll be doing a series of different weight training exercises in a row without stopping.
When you circuit train you get your heart rate up as you do the weight training exercises back-to-back without stopping.
Circuit training is a good way to combine both:
Pick 1 of the 4 Circuit training workouts at the top of this page and... You only need to do one of the above workouts for 10-to-20 minutes.
To get a better workout make sure that you have everything setup before you start the circuit. Stopping in the middle of a circuit to setup equipment would defeat the purpose of having a circuit. The constant stopping to get equipment would take away the aerobic fat burning benefit.
Circuit training or any other weight training workouts should be performed 2-to-3 times a week.
John,
You'll lose some weight but probably not 20 pounds because these are all circuit training workouts whose main focus is to tone or build up your muscles while burning some fat