My wife walks two to three times a day and uses her Tickr paired to Cyclemeter. Cyclemeter also has a setting for walking where there is no threshold for auto-pause. The makers of Cyclemeter also have an app called Runmeter, which would probably be a little better for running and walking.
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HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress