Classpass aims to simplify the way we exercise today. You purchase a package of classes such as 5, 10, or 20 which you can then use at several gyms to choose from thousands of workouts. Then simply use the app on your phone or go directly to their website to book a class. You can input specific goals and interest and Classpass will even begin to recommend classes they think are best for you. Just like Yelp for workouts there are user based ratings and comments for every class so you know exactly what you are getting into before registering for any class.