From The Dept. Of “You Could Do That, But . . .”

Yes, there are times when it just might be better to get out and walk:

Riding the New York City Marathon on the city’s mass-transit system was almost as grueling as running it.

It took seven buses and three subway trains to trek through five boroughs along roughly the same 26.2-mile route some 40,000 runners will follow this Sunday.

My race began on the S53 bus in Staten Island, and like the start of the actual marathon, there was little space to breathe.

I had to duck errant elbows and fists, and thanks to one of my fellow riders, I was overcome by the odor of a thousand people sweating.

. . .

If I made every single connection, I could complete the marathon in three hours, 45 minutes — a respectable finish an hour quicker than my running time last year.

. . .

I crossed the finish line in Central Park in four hours, 57 minutes — two minutes slower than I ran the race in 2006.

Of that time, I spent three hours, 15 minutes riding buses and subways and another one hour, 42 minutes waiting for them.

Along the route that took me on seven buses and three subways, I swiped my MetroCard 10 times.