I agree with both of the above posters.
It does take a while for the body to adapt to stresses and impact of running.
It is important to build up a solid base of walking first. 3 miles is a good benchmark, although you would want to have 2-3 months of this under the belt.
A Couch to 5K program is definitely the best way to transition to running. These program work through progressively increasing intervals of running and walking. The program lasts 8 weeks, although you should feel free to repeat a week if you feel you need to give your body additional time to adapt.
You should train in conditions that are as close to what you will race in, and treadmill running is a little different from running outside. So you should do as much of your training outside as you can. Although the treadmill makes a good way of keeping your training program on track when the weather prevents you from running outside.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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