Get a heart rate monitor and start Gallowrunning (running with walk breaks), keeping your heart rate under 142 beats per minute (Maffetone Training), whether your walking or running. You have a lot of extra weight and you want to take it easy, making sure you stay aerobic at all times until you've dropped the weight. You want to be healthy and uninjured while you do this, and this strategy will improve those odds.
Make some goals. Boston is a good long range one, but you need shorter, more tangible ones. Start with a mile a day, and go a little extra every week. No more than a mile extra. Once you get to 20 miles per week, increase by 5% per week. You can also go by time instead of mileage. Use the same principle of increase. You want to stay healthy and uninjured.
Make a goal to run/walk a 5k this fall. Not trying to race it, but just showing and going the distance, being part of the healthy scene. Perhaps in December. Then make another goal, maybe run/walk a 5 miler.
Be patient, go one day at a time, one session at a time.
Also, I suggest you follow hrad/eassy day approach at some point. Hard days are more miles or time, and easy days are less miles or time or rest. Also, every 4th week or so, cut back your time and rest, then pick up the following week where you left off.
I used to way 60 pounds more than I do now. I began walking first for many years, then I became a runner/racer when i was 50 pounds lighter.
You can do it.
Join a running/walking club! Get active.
There is a good thread about Galloway's ideas on Coolrunning, and also a good thread in basic training on Maffetone Training.
Good luck. Think healthy heart, healthy lungs, good relationships....
--Jimmy
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