Cupo- That works too if the person is halfway through the run. But on thouse really long runs (1/4 - 1 mile) and the person it at the very top of the run, ask before stepping in about 30-50 yards below them.
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They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.