After the initial 2-3 weeks running, you should be feeling more comfortable running regularly and well accustomed to your training plan. Hopefully you have also been varying your running to include some faster, harder efforts in between your runs.
By your fourth or fifth week of training, you should not really be increasing the mileage too much. The increase in effort will come from running more frequently at threshold pace, or in other words, a pace that you would be happy to stop at if you could! An example would be running 2 miles slow, 1 mile fast and then 2 miles slow. Short bursts such as these will help you to run closer to your best for longer periods in the weeks to come. Another addition to your schedule halfway through could be the long run on the weekend. Running 8-10 miles at an easy pace will introduce the miles to your legs whilst also building stamina. Mix this with a 5-6 mile paced run and you will increasingly see the benefits of a sustained training period.
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