Kali Muscle suffered a major health scare Saturday while doing what he does best — working out at the gym, TMZ has learned.

The popular bodybuilder and YouTuber — whose real name is Chuck Kirkendall — passed out cold while exercising in a fitness center in California, his ex-wife, Dvyne Dirkendall, tells TMZ.

Kali was rushed to a hospital for treatment, but Dvyne tells us she doesn’t know why he fell unconscious or the status of his condition. She noted Kali previously had a heart attack and needed a stent inserted into his heart to restore blood flow.