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Period: to
Walking 5 miles
I will walk 5 miles a day every day to increase my endurance. -
Period: to
Jogging 5 miles
I will jog 5 miles a day everyday to increase my endurance further -
Period: to
Running 4 miles
I will only run 4 miles everyday to prove I have increased my endurance -
Running 5 miles
By now I should be able to run 5 miles because my endurance will be able to carry me that far, but if not I will continue working towards that goal.