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National Academy of Sports Medicine answeredThe length of circuit training is a very important factor when developing your program. One of the benefits of this type of training is that the workout is highly effective in a small amount of time. For anyone just beginning, 30 minutes should be enough time. With many athletes, 45 minutes is usually the maximum they can handle while maintaining focus and form. The only reason someone should go longer is if they are a beginner, in which case I would add a significant amount of recovery time to their program. They are not doing more work, rather are simply taking a longer time to complete the work. As they improve, the rest periods will decrease, which in turn will make the total time of the workout less. However at this point the work period may be a bit longer. Another important factor is how long you do metabolic training before going on to another type of training. If you are just trying to jumpstart your program because you have hit a fitness or weight loss plateau, doing metabolic training for one to two weeks will help you get back on track and you can then move on to the next phase of your training periodization. If you would like to use this as a phase in your yearly periodization cycle, using a metabolic progression which begins slowly and builds up for four to six weeks will be beneficial.
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