5th Line Studio

This River North gym near the Merchandise Mart concentrates on the Gyrotonic machine (which allows you to stretch and strengthen muscles). But other classes include Pilates, yoga and UltraBarre, a mix of ballet barre, dance conditioning and Pilates-based movements taught by Joffrey Ballet pros. Rates start at $85 for private sessions, $60 for groups of two and $17 for small group yoga classes.