Taylor Kinney, Sophia Bush and others battle it out at Flywheel in Chicago

Credit: Daniel Boczarski Photography

A little friendly competition never hurt anybody – in fact, it can do a lot of good.

The casts of NBC’s Chicago Fire and Chicago P.D. battled it out at cycling studio Flywheel in Chicago on Sunday to benefit families of police officers, firefighters and paramedics who have lost their lives in the line of duty.

Stars including Taylor Kinney, Jesse Spencer, Monica Raymund, Sophia Bush, Jesse Lee Soffer, Jon Seda, Marina Squerciati, Josh Segarra, David Eigenberg and more sweated it out for the 100 Club of Chicago, and they’ve raised $14,000 so far.

The studio was divided “into two sections, with Chicago Fire in red shirts on one side and Chicago P.D. in blue shirts on the other. They were each cheering for their team and calling out people on the other side,” a source tells PEOPLE.

“They also all put their character names up on the leaderboard which was cute,” says the source. “So Taylor was ‘Severide’ and Jesse was ‘Casey.’ Sophia was ‘Lindsay’ and Marina was ‘Burgess.’ They all went by their names on the two shows.”

Out of the women, Squerciati from Chicago P.D. came out on top with costar Bush not far behind, and Segarra and Spencer took it for the men, with Kinney in fourth place. However, Eigenberg wins the prize for “most enthusiastic.” He was “cheering and screaming the entire ride,” says the source.

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