CHICAGO (WLS) -- It's the day athletes have spent hundreds if not thousands of hours training for. The 2024 Bank of America Chicago Marathon.
50,000 athletes will run through 29 of Chicago's neighborhoods on Sunday.
The race will start and finish in Grant Park.
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Many athletes are also running to support different charities.
In fact, just last year more than $30 million were raised collectively by runners for more than 200 organizations.
The first wave of athletes takes off just at 7:30 a.m.
Cris Colon, a Chicago firefighter said he is running the 2024 Chicago Marathon to raise money for fallen fireghters.
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Last year, Kelvin Kiptum finished the marathon in 2:00:35 with an overall pace of 2:52 minutes per kilometer
He broke the marathon world record. Sadly, Kiptum was killed in a car crash in Kenya in February.
There will be a moment of silence before the race kicks off to honor Kiptum.
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