People.com: The Casts of Chicago Fire & Chicago P.D. Spin for Charity

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. Read on here.