If that works for you then fine, but best not to call them W7 runs, because those are 25 minute continuous runs and you will need to have three of those under your belt before you move onto W8.
What is making stop running?
If you are exhausted, maybe you are going too fast.......you need to be able to speak clearly as you run.......if not, slow down, as explained in the guide to the plan.
Are your legs aching?
If so, it could be you need longer between runs or perhaps you are not hydrated adequately.
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