<p>Another option for you, Matt, is to wing it. By wing it I mean that you decide to run every day (or often) for a certain time or distance, but on some of those runs, say, once or even twice per week, when the engine is revving and wanting to go, go with it. I do this throughout the year, especially when I'm not in the middle of proper speed work. That will afford you an extra session per week where you can get stronger and keep the legs firing. Keep in mind that speed and strength are, depending on where you are with your running, one in the same. For some they are not the same. But for others, especially those who haven't had years of doing speed work, you will get both faster and stronger that way. This is exactly how you hear people say, "I can't believe I PR'd the race... all I did were long runs, with no speedwork." That just means that these people have not reached their peak. Because you get to a point eventually where if you do not do speed work, you will not come too close to any PR. You can gain ground by increasing mileage, but only to a point. Eventually you will plateau, and that level will be lower than you can if you did the best of both worlds with long AND speed and tempos, like with a solid training program.</p>
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<p>Honestly, after thinking about this thread and the course it took (based on what you had to say of your goals and interests), find out what works for you in what will keep you motivated to maintain a higher weekly volume. If you get inspired by running an hour a day, go for it. If you rather like to mix it up (which seems more your personality, which is why I am surprised you are thinking otherwise), I would insert some *mild* (so not to injure or burnout) speed sessions (call them fartlek or pickups or what ever you want) and hills over runs of varying distances. The monotony of running the same distance day in a day out, especially for those who run alone, and at the same pace tends to burn most people out. It gets boring. Challenge yourself, either physically with a tougher workout here or there, or even in route selection, and you will make it stick and stay motivated. Also consider finding a group to run with. Group runs are what I call "free" runs. They are so easy (and they are fun) that they almost don't count -- but in a good way, because they don't aid in burning you out, they keep you motivated, and all you have to do is plan the rest of your runs. The group runs come free. And they are a great way to build a substantial base like you're talking.</p>
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<p>Maybe even consider joining a marathon group. Stay with them until they bridge the 15 mile barrier. And you can still run with them, just stop at 15, and give input to the group so that they can plan routes that drop you back off at home or your car at your desired distance. That's what my friends and I do.</p>