CHICAGO (WLS) -- The annual "Hustle Up the Hancock" had thousands of participants lacing up their shoes Sunday morning.
Walkers climbed the building's 1,632 steps to the 94th floor of the Hancock Building.
The event is a fundraiser for lung disease research through the Respiratory Health Association.
Thousands climb 1,632 steps for "Hustle Up the Hancock" event
WLS
