Bells Up is a lifestyle app developed by Kettlebells Up LLC for iPhone users. It offers a comprehensive strength training program that focuses on kettlebell workouts and bodyweight exercises.

With Bells Up, you can follow a recorded program that is designed for beginner, intermediate, and advanced levels. Unlike other fitness apps that require you to choose from a variety of classes, Bells Up provides a guided program that ensures measurable progress over time.

In addition to the strength training classes, Bells Up also gives you access to The FitFourth on demand library. This includes pre/postnatal strength classes, recorded content with technique explanations, and optional specialty programs for kettlebells, pull-ups, and barbell work.

The app offers monthly or annual memberships with new content added on a weekly basis. As a member, you get full access to all Bells Up on-demand programs and specialty programs.

Please note that to access all features and content, you need to subscribe to Bells Up on a monthly or yearly basis with an auto-renewing subscription through the app. The pricing may vary by region and will be confirmed before purchase.