The guide is that if you complete a run then you move on.......if you don't complete, you repeat. This maintains the impetus. Sometimes repeating a week becomes demotivating, causing some to give up because of lack of progress. There is not a lot of point continually repeating a run you know you can do, because you are not sure you can do the next one. Try it and see.
All that said, you are in control and each run will be strengthening your body, preparing it for those to come.
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