The other thing is that 15 miles in a work day spent going to fetch items really isn't that much when you break it down.
It's 2 miles an hour for 7.5 hours. I'm 50 years old, 5'8" and 200 lbs and I don't see that as being anything close to a strain on my capabilities. Temperature can be an issue, but as long as you stay hydrated it's manageable too.
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