CHICAGO (CBS) — Mayor Rahm Emanuel said “the world will watch the endurance of the human spirit” at Sunday’s Chicago Marathon – the first major marathon after last spring’s bombings in Boston.

Emanuel had one request of the 45,000 runners.

READ MORE: Three Men Shot At Stadium Sports Club In Rolling Meadows

“If you get a chance, look up. Look around. You’re going to see the most American of American cities,” he said.

READ MORE: University Of Chicago Folk Festival Works To Adapt Again Amid COVID-19 Surge

Emanuel talked about the city’s preparations.

“Post-Boston – while we will do our job so everybody can enjoy and have great fun, the fact is that people coming back – we had a record number last year. We expect a record number of people running this year. And the world will watch the endurance of the human spirit to persevere,” he said.

MORE NEWS: Chicago Weather: Metra Sets Tracks Ablaze To Combat Extreme Cold

The mayor said it will amount to the entire country — and the entire world — coming together to say we will not be deterred.