Based on the user reviews of the "Upper Lower 4 Day Gym Bodybuilding Split Workout" app, here are the pros and cons in 15 words or less: **Pros:** 1. **Effective workouts**: Users praise the app's workout plans for helping them achieve their fitness goals quickly and effectively. 2. **Convenient planning**: The app makes it easy to plan and track workouts, with customizable routines and progress tracking features. 3. **Inspiring community**: Users appreciate the sense of community and motivation that comes from using the app and tracking progress alongside others. **Cons:** 1. **Insufficient guidance**: Some users feel that the app lacks sufficient guidance and support, particularly for beginners or those with limited experience. 2. **Technical issues**: A few users have experienced technical issues, such as app crashes or connectivity problems, that have hindered their workout experience. 3. **Limited flexibility**: Some users find the app's workout plans too rigid, with limited flexibility to accommodate for different fitness levels or goals.