Kick Your Own Butt With These Female-Only Fitness Classes

This list would be remiss without Curves, which launched 30 years ago as one of the original nationwide, female-only gyms. Curves is known for their 30-minute circuit class, which incorporates strength training, cardio, and stretching, and has you working closely with a trainer. Over the years, it's expanded to offer additional classes, including high intensity cardio, high intensity boxing, lower intensity "body basics," and lower intensity balance. Over 4,000 gyms sprawl the US.

Image via @curvesofficial