75 Hard is a self-improvement program created by entrepreneur and influencer Andy Frisella. It is a 75-day challenge that aims to build mental toughness and improve various aspects of ones life, such as confidence, self-esteem, self-worth, self-belief, fortitude, and grittiness. The program revolves around completing five "critical" daily tasks every day for 75 days straight:

• Follow a diet. Any diet is allowed, but there can be no cheat meals or alcohol consumption.
• Work out twice a day for 45 minutes. One of those workouts must be outside.
• Drink one gallon (3.8 liters) of water per day.
• Read 10 pages of a non-fiction book per day.
• Take a progress photo every day.

75 Hard is not a fitness challenge, but a "transformative mental toughness program". While it includes a fitness component, the program supposedly targets a number of other self-improvement aspects aimed at transforming ones overall life. However, experts generally feel that 75 Hard is unnecessarily restrictive for achieving its stated goals and may have significant downsides for some individuals. It is recommended to consult a physician or other health care professional before starting 75 Hard or any other fitness program to determine if it is right for ones needs.