Quote:
Originally Posted by BWillie
I probably walk 15 miles a week in the summer but it does not appear to do anything for me in terms of improving my resting heart rate or ability to run long distances.
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You're not getting your heartrate up to the right level. Doesn't matter if you walk/jog/row/stairmaster/whatever, it's all wasted unless you get your heartrate up to the right range. For me, at 54, I have to keep my heartrate up to at least 135-150 range/25-30 minutes to improve my endurance (presumably my resting heartrate as well, though it's been pretty steady at about 58 beats/minute for 6-7 years now).
I'd probably run for around half a mile, then walk until you felt like you could jog again, rinse and repeat, instead of just walking for 3 miles/day. Or walk uphill at about a 3.0 mph pace for 3 miles. A weighted vest/carrying weights would probably also do the trick.