Sir Paul McCartney has said he's been doing exercise for years - on stage.

The Beatle, who turned 70 today (June 18), is quoted by the Daily Star as suggesting that he treats live shows as something of a workout.

However, he added that he still isn't feeling the pain despite his age. He said:

"I've been having cardiovascular exercise for years but it's on stage. I can't believe I do a three-hour show without taking a breath. You assume you would be feeling it now but it's the opposite."

The music world meanwhile have been paying tribute to McCartney as he celebrates his 70th birthday, with Paul Weller recording a special charity cover for the occasion.