There is not one and only one possible accepted definition of the term "circuit". A "circuit" is ANY collection of exercises done one after the other, with or without a break, and with or without repetition.
Out of curiosity I googed "What is circuit training" and looked at the top 7 results:
1. Wikipedia "Circuit training is a form of conditioning combining resistance training and high-intensity aerobics."
2. Brain Mac Sports Coach. Describes a circuit as a series of strength exercises, but then goes on to include many kinds of jumps, shuttle runs, burpess, and other things that are either clearly cardio or have a strong cardio element when done in circuit style.
3. About.com (sports medicine). Says that circuit training means doing exercises rapidly without rest between. It's a little less clear than other sites about whether incorporating cardio now makes it "not a circuit" as the Sgt says, but definitely states it'll build cardiovascular fitness.
4. About.com (exercise). Lists some circuit ideas which include cardio moves of jumprope and jogging/walking.
5. Sport Fitness Advisor. A little vague on whether including cardio makes it "not a circuit", but goes on to describe 20 circuit moves, including fast feet, high knees, treadmills (mountain climbers) and other cardio elements.
6. The Muscle Diary. Talks from a strength training focus, but includes running, jumprope and biking in suggested circuit moves.
7. CircuitTrain.com. Describes how circuit training initiated as muscle endurance building with strength moves, but that now aerobic circuits are very popular.
So there you have it. Not exactly a list of the most definitive authoratitive sources, but heck - a sampling of top 7 results for "What is circuit training" ALL agree that including cardio is fine and still called "a circuit".
Contrary to popular misuse terminology this is a combination workout and not a circuit workout. A circuit training workout is a series of strength training exercises folowed by a recovery period before the next round of the circuit. Done this way there is a built in cardio benefit without any dedicated cardio exer4cises. Adding cardio only adds a couple of percentage points to the cardio benefit built in.
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