AND MORE OF THESE INCREDIBLE ATHLETES ARE BEGINNING TO CROSS THE FINISH LINE HERE IN GRANT PARK. AND LET ME TELL YOU THAT SUN IS BEAMING DOWN. IT IS HOT OUT HERE, BUT THIS IS WHAT'S HAPPENING WHEN THEY ACTUALLY CROSS THE FINISH LINE, THEY COME ACROSS RIGHT HERE AND THEY'RE COMING OVER, GRABBING ONE OF THOSE AWESOME COLD WET T SHIRTS TO COOL OFF JUST A LITTLE BIT. AND THEN THEY'RE COMING OVER MORE. WHAT ARE THEY DOING? >> THEY'RE COOLING OFF WITH A NICE SHOWER, WHICH RIGHT NOW SOUNDS FANTASTIC. >> AND I HAVEN'T EVEN COMPETED TODAY OR ANYTHING LIKE THAT. WE ACTUALLY HAD THE CHANCE TO CATCH UP WITH THE FIRST FEMALE TO CROSS THE FINISH LINE TODAY. SHE'S FROM CHICAGO. THIS IS WHAT SHE HAD TO SAY. THIS HAS BEEN A REALLY FUN COURSE. >> LIKE BEING ON THE LOWER WACKER WAS LIKE, ABSOLUTELY INSANE. I DON'T RECOMMEND RIDING A BIKE DOWN THERE, BUT IT WAS REALLY FUN. >> REALLY EXCITED. >> WHERE MY FITNESS IS RIGHT NOW AND REALLY EXCITED TO HAVE THE WHOLE WEEKEND. >> IT'S BEEN GREAT. NOW MARK, IT'S ABOUT TO. >> SO MUCH GOES INTO PREPARING FOR AN EVENT LIKE THIS, ESPECIALLY ON A DAY WHEN IT IS SO HOT. SO THERE'S JUST SO MUCH SATISFACTION THAT YOU CAN SEE ON THESE ATHLETES FACES AS THEY CROSS THE FINISH LINE RIGHT HERE IN GRANT PARK ON THIS SUNDAY MORNING. THE SECOND HEAT BEGAN JUST ABOUT AN HOUR AGO AT 8:00, SO WE SHOULD EXPECT SOME OF THOSE ATHLETES TO