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Many people who have turned to a circuit training health club seeking quick weight loss get discouraged because they find that, once they start exercising consistently, they do achieve some results. Sooner than expected, however, they reach a plateau and have their progress grind to a halt. These folks aren't doing anything wrong; they just lack the weight loss information needed to continually make headway toward their fat loss goals.

What these folks need is circuit training equipment that features adjustable resistance. In other words, they need the ability to increase or decrease the amount of resistance on the workout equipment.

Why is this important? Why not have just one level of resistance?

With only one resistance level, the typical 30-minute circuit workout gym franchise is unable to meet the long-term fitness needs of their members.

The 'Principle of Progressive Overload' maintains that once the body has adapted to the stress put upon it, no further progress will be made until 1) resistance is increased or 2) repetitions are increased. This puts a gym without adjustable resistance in the uncomfortable position of having their members 'plateau' once they have mastered the equipment. Depending on their age and prior fitness level, their members soon find that their progress has come to a halt.

Most circuit gyms are unable to adjust their resistance settings, so by definition they cannot promise life-long progress. Of course, their members could simply do more repetitions (exercise for 45-60 minutes), but that invalidates the entire 30-minute workout concept.