SOCIAL MEDIATikTokViral Challenges WARNING: TikTok “75 Hard” Fitness Challenge Potentially Dangerous by Skyler Romero March 21, 2021 by Skyler Romero March 21, 2021 The TikTok “75 Hard” Challenge has users working out and dieting hard, but some experts wonder whether it’s safe. Get the story here. 0 FacebookTwitterPinterestEmail