Should you try the 75 Hard challenge? Experts warn the risks may outweigh the benefits

By Lily Hautau, CNN (CNN) — Five requirements. Seventy-five days. No breaks and no room for mistakes. That’s the premise of 75 Hard, a challenge created by entrepreneur and author Andy Frisella and marketed as a “transformative mental toughness program” and “an ironman for your brain,” according to his website. Chicago runner Sarah Lyons learned