You can take your workout out of the gym and into the fresh air at Stalica Park. It's a great spot to do some situps, stretches or maybe even a little yoga.
You'll have sightseeing choices galore in Schiller Park. Stalica Park is a good place to start here, but there are lots of other fine places to enjoy. Allstate Arena, Fashion Outlets of Chicago, and Rosemont Theatre are close to the outdoor sports and fitness area and and will cap off your day nicely.