Everyone I know seems to be doing the 75 Hard challenge - but top experts warn it could actually be detrimental to your health

A woman doing the 75 Hard workout in the gym with a medicine ball.

If you've been on TikTok recently, you've likely seen the 75 Hard Challenge on your feed. The challenge - which has over two billion views under the #75HardChallenge hashtag - promises to help you lose weight and build muscle in the space of (yep, the clue was in the name) 75 days.

So, what makes this challenge different from the thousands of others on the Internet? Good question. Branded as a "mental toughness programme" rather than a diet or fitness challenge, the website promises to "change your life" and help you "take complete control of your life in only 75 days."