There is not much info here on your training. I don't know where you're at as a runner. Particularly, you have not included the intensity of training and duration. There is a big difference between a 3 mile workout sessions at your easy pace to 24 200M runs at an intense interval pace. Also the decision to include more mileage may come from your feeling that you're finding your workouts too easy or you are not improving fast enough. For the first case, more mileage might work or might injure you; restructuring your training plan may be a better option for either case. Please include more detail.

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