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Anonymous
from wiki, take it as you will
Circuit training is well suited for developing aerobic endurance or fat burning. It is, however, not so suitable for those wishing to build strength or muscle bulk. The duration of some circuit training stations can be in the region of 45 to 60 seconds, and in some cases as long as two minutes. These circuits typically mean that the number of repetitions performed on each station is relatively high, putting each exercise way out on the endurance end of the intensity continuum.
Those wishing to optimise increase in strength or muscle bulk (hypertrophy) can reduce the number of repetitions performed and increase the weight to be lifted or increase the intensity, when hydraulics or elastics are used. On the other hand, longer station length is quite appropriate for any cardiovascular (aerobic) stations included in the circuit.
Where all the participants have an adequate level of experience, the station times could be reduced to, say, 15 or 20 seconds. This will encourage the participants to lift heavier weights, aiming to achieve overload with a smaller number of repetitions, typically in the range of 4 - 8 or 8 - 12, depending on the specific training goals[4]. However, this would provide little time for the instructor to supervise technique, posture and form to ensure that the activity remains both safe and effective.
http://en.wikipedia.org/wiki/Circuit_training#Disadvantages_of_circuit_training
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