Curves, Saint Charles

As they enter the training circle at Curves, female guests come face-to-face with the smiles of other women. And just as points on a circle share a common distance from the circle's center, workout participants share the experiences of those nearby, trading stations throughout the 30-minute training session. One minute is spent on a piece of strength-training equipment built for feminine frames and designed to work two opposing muscle groups with a single movement. Exercisers then move on to a recovery station, where they run, jog, or dance to maintain heart rates and keep platforms in place during momentary losses of gravity.

In 2014, Curves partnered with celebrity fitness expert Jillian Michaels to design a new take on its traditional circuit. These workouts incorporate functional bodyweight exercises—each with modifications—into the existing sequence, providing a slightly more intense gym experience intended to jump-start metabolisms while still forging lean, toned muscles.