NKD is an Android application developed by TRAINERIZE, available for free in the Lifestyle category of the Google Play Store. This app is designed to help users transform their bodies through online coaching and personalized workout plans.

Upon downloading and opening the app, users are prompted to create an account and fill in their personal information, including their fitness goals and current fitness level. From there, users are matched with a personal trainer who will create a customized workout plan tailored to their specific needs.

The app also includes a nutrition tracking feature, allowing users to log their meals and monitor their caloric intake. Additionally, users can track their progress through the app's photo and measurement tracking feature. Overall, NKD provides a comprehensive, online fitness experience that is both convenient and effective.