Over the years, The Beatles singer Paul McCartney has shared more and more details of his health – the good and the bad. For one, the star recently opened up about his own past struggles with mental health and alcoholism during the peak of his career. He told GQ Magazine: “In truth, I just took to booze. There wasn’t much time to have mental health issues, it was just, f it, it’s boozing or sleeping. But I’m sure it did, as they were very depressing times.” But in a series of interviews before that, he shared insights into his quirky longevity regime.

Perhaps one of the most unusual things that McCartney swears by is eye yoga.

On the podcast Table Manners back in 2021, he explained where he first came upon the activity.

“I learned [it] off some yogi in India,” he said.

“He explained that your eyes are muscles whereas your ears aren’t, so you can’t exercise your ears. But your eyes, you can.”

But what exactly is eye yoga? McCartney didn’t hesitate to divulge instructions to the podcast audience.

READ MORE: Clint Eastwood health: The anti-anxiety trick the star has used for ‘over 40 years’

In a throwback interview, the star also explained he does lots of exercises – including head-stands.

“I feel pretty fit,” McCartney told The Mirror. “I’m not the sort of person who particularly needs a trainer. I’ll just watch what the trainers do and then copy them.”

“I do a bit of the cross-trainer, a bit of running, a bit of cardio and then I do some weights, some abs on the Swiss ball, before ending up on the mat doing a few stretches. And then standing on my head.”

This story originally Appeared on Express.co.uk