Based on the user reviews on the App Store, here are three Cons and Pros of the Jack 3D app, each limited to 15 words: **Cons:** 1. "Too many ads, really annoying and disrupt the workout experience." - many users. 2. "Limited customization options for workouts and plans are too repetitive." - several reviewers. 3. "Glitches and lag, sometimes app freezes or crashes during workouts." - some users. **Pros:** 1. "Workouts are challenging and effective, helped me reach my fitness goals." - many users. 2. "Love the variety of exercises and focus on full-body workouts." - several reviewers. 3. "User-friendly interface and motivational prompts keep me engaged and motivated." - most users.