The 75 Hard Challenge app is a comprehensive program aimed at fostering mental toughness and self-discipline over a 75-day period. Users are required to adhere to a strict regimen that includes following a diet without cheat meals, drinking a gallon of water daily, and completing two 45-minute workouts, one of which must be outdoors. Additionally, participants are encouraged to read 10 pages of a non-fiction or self-development book each day and take a daily progress photo to document their journey.

In terms of tracking, the app allows users to log their weight daily and save progress photos to visualize their transformation. While the challenge emphasizes physical fitness, it also focuses on overcoming mental barriers and reshaping habits for long-term success. A subscription is required to unlock all features, ensuring users have access to the full suite of tools necessary for their transformative journey.