Based on the users' reviews of the Ninja Running app, here are three pros and three cons: **Pros:** 1. "Great way to track my runs and monitor my progress, love the gamification aspect." 2. "User-friendly interface and easy to set goals and challenges for myself." 3. "Love the voice cues and notification system, keeps me motivated and on track." **Cons:** 1. "Organization and customization options could be improved, feels a bit clunky." 2. "Sometimes the app freezes or crashes, causing me to lose track of my run." 3. "Wish there were more features for analytics and detailed tracking of my performance."