The benefits of running are cumulative. That is to say, you will experience mileage you run today far in the future.
Don’t get me wrong, if you run today you might feel great right away. But the benefits you experience aerobically, or to your resting heart rate, or your overall speed happen over the course of many runs.
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Running on roads periodically, will likely allow you to get more cumulative mileage under your belt, which will in turn help your overall fitness level. This can be specifically true if you find yourself only being able to find time to run trails on the weekends. Adding one or two short road runs each week could add HUGE cumulative fitness benefits over the long term.
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For example, running three road miles on a Tuesday and Thursday doesn’t sound like a big deal BUT if you do that every week for two months, you will have added 48 total miles of running… This is mileage you may otherwise not have gotten in.
In other words, running on the road is a way to increase mileage and strengthen your aerobic engine.