‘A Man Without Love’ singer Engelbert Humperdinck credits underwater workout for keeping him ‘alive’ at 90

At 90, Engelbert Humperdinck has an unusual workout routine he credits with keeping him "alive" and going strong.

The British singer, known as the "King of Romance," recently appeared on "The Jim Masters Show," where he shared his unconventional exercise regimen.

"I walk out in the pool all the day," he told the host. "I do all my martial art moves in the pool underwater, which makes it even more effective. … And that’s how I stay alive and keep going and keep myself as fit as possible...