75 Hard, a popular fitness challenge, has gained immense attention with over 44 million posts on TikTok. The challenge involves following strict daily rules for 75 days, including two daily workouts, a specific diet, and a progress photo. While 75 Hard claims to be a transformative mental toughness program, experts warn about potential risks, including overtraining syndrome and negative body image. Personal trainer and nutritionist Eleanor Heaton-Armstrong advises approaching health changes with flexibility and personalization, emphasizing sustainability over extreme restrictions.