Hundreds of runners are getting ready to take their fitness to another level at one of the city's most iconic landmarks.

The 36th annual Empire State Building Run-up takes place tonight.

More than 600 competitors will have to climb more than 1,500 stairs as they race to the observation deck on the 86th floor.

Among those taking part are defending champ Thomas Dold of Germany, who is looking for his eighth straight victory.

NY1's Pat Kiernan and Jamie Shupak will be among those taking part.

The race is organized by the New York Road Runners club.