There's a group of folks doing some FREE outdoor workouts in Woodridge's Castaldo Park. These functional fitness workouts are heavily based off CrossFit's methods and movements.
The group called Amplify Fitness is led by Anthony G and Mike V. They are both CrossFit Level 1 trainers. I don't know Anthony, but I've met Mike a few times at various fitness events and competitions.
Workouts are every TUESDAY at 6:30PM, at the park near 71st St and IL-53. I've been told these workouts will last through September. If you are interested, email Anthony at firstname.lastname@example.org.