Research has shown that when volunteers performed circuit training for just 20 minutes, 3 days a week, they improved their fitness levelsby up to 11%. That's about the same cardiovascular boost a similar group got wheb they jogged thirty minutes, 3 days a week.
More recently, researchers found that when previously sedentary adultseither circuit trained or did endurance exercisessuch as cycling or cross country skiing for 40 minutes, 3 days a week, both groups have similar aerobic benefits, with the circuit trainers reaping the added benefit of increased muscle strength.
Another advantage of circuit training is that it's fun because you are constantly moving to a new exercise, which keeps it interesting.
The article above came from Total Body Firm-Up from the editors of Prevention.
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