Meet Bob. Bob is your average, everyday ultra runner. (all oxymorons aside, please) His weekly schedule is pretty steady: he runs about 5 days a week. A creature of habit, he runs the same 30-mile loop every weekend for his long run.
Bob's weekly mileage for the past two months: 70, 70, 70, 70, 70, 70, 70, 70.
Meet Bob's brother, Billy. He runs with Bob every single weekday. He does the same long loop with his brother when he can, which is every other Sunday. (Billy works one day every weekend, but that day alternates every week) On the weeks where he works on Sunday, he simply does the long loop on Saturday instead.
Billy's weekly mileage for the past two months: 40, 100, 40, 100, 40, 100, 40, 100.
How is this possible?
And furthermore, what lesson can be learned here?