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I would worry more about the time than the distance. Your heart doesn't care how far you went, just that you got your heartrate up for a good 20-30 minutes.
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I totally agree! My sister-in-law is a nurse practitioner working for a cardiologist. We both have treadmills that we use during the winter months when the weather is bad. She is always telling people they need to warm up for 5-10 minutes and then increase the speed and walk at least 30 mins at a good pace, followed by 5 or 10 minutes of cool down.
Karen