Los Angeles, April 24 -- Hollywood icon Demi Moore, long regarded as a paragon of physical dedication, is now pulling back the curtain on the psychological costs of that pursuit.

At the age of 62, "The Substance" star is candidly revisiting the toll such extreme once took on her well-being - physicality, mentally and emotionally.

In an exclusive conversation for PEOPLE 's 'World's Most Beautiful' issue, Moore opened up about the 'self-imposed torment" she endured for roles in films like "Striptease" (1996) and "G.I. Jane" (1997), where her dedication to physical transformation bordered on obsession.

"I mean, crazy things [with] diet and exercise, biking from Malibu and going all the way to Paramount about 26 miles," she recalls in this...