As the race continues, the challenges increase with inclines on First Ave into The Bronx and the rolling hills of Central Park in the final miles, making New York a yo-yo of easy and hard miles. This relentless design isn’t all that slows runners down.

The New York City Marathon charts a 26.2 mile course throughout all five boroughs tomorrow. Here's a look at the route maps.

More than 50,000 runners are participating in today’s New York City Marathon. Follow along for the latest updates and analysis.