Circuit training routines are pretty easy to design if you understand the primary goals. You don't even need an advanced degree in muscle science to set up a circuit training session that will help you burn fat in a fast total body workout.
Basically all that is involved in circuit training is you pick a handful of exercises that each target different muscle groups and then do those exercises without a break in between them. This completes one circuit. You might have heard of this before referred to as high intensity training. You rest for about a minute and then repeat. Depending on your goals you can repeat the circuit training routines numerous times in one session. For general fitness you will normally do a circuit between 1-3 times. In endurance training you might perform the circuit 5-7 times. How many times you can actually complete the cycle is going to be dependent on the exercises you pick and your current fitness level.
Perform each exercise for 1 minute and do as many repetitions as you can. Rest for 1 minute and repeat. Perform this circuit 5-7 times.
Perform 10 reps on each exercise then immediately move to the next exercise. After completing all reps rest for 60 seconds and repeat 3-5 times.
Perform each exercise for 1 minute then immediately move to the next exercise. After completing all reps rest for 60 seconds and repeat 3-5 times.
As you can see you have almost limitless options of putting a program together. Pick 5-12 exercises that hit different parts of your body and string them together so that they give each muscle group a little break. If you are just speeding up your weight lifting program then make each exercise based on a rep range. If you are looking for cardio or general fitness make each exercise based on a time range. I would recommend not going over 2 minutes per exercise and I would not use this strategy for a strength training program. Strength training requires plenty of rest between sets and strict form to prevent injury. Circuit training routines are really good for burning body fat, increasing your cardio conditioning, or improving your endurance. If your goal is strength or size then this is not for you.
Some people look at this method of training because of the weight loss potential involved. While I can't argue that this does burn some serious fat I would opt for calorie control and maybe doing a couple sets of burpees after my strength training workout if you are looking to build muscle as well. It really all goes back to your defining your goals. If you number one priority is weight loss then go for it. If your number one priority is strength or size then leave it alone.