Walking won't be so stressful as to be a worry. Do as you feel.
Garmin and Timex both make watch type GPS recievers with a heart rate monitor included.
Somewhat pricey, though.
I use a Garmin 305 Forerunner(138.00 on Amazon) as a bike computer.
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"To give anything less than your best is to sacrifice the Gift."
Steve Prefontaine
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