http://www.rollingstone.com/music/ne...0130507?page=3

He is terrifically fit, so we talk for a while about his physical regimen – "I have to bump it up when I do a tour, but I don't have to start from ground zero. That's fairly important for me, to keep that" – and I also ask about how he prepares for the songs' vocal requirements. "When I'm onstage," he says, "I'm not just singing. I want to do a performance, as well, so that's waving my arms around and running around, and I'm dancing. That takes 50 percent of your breath power, so my challenge is how to balance that with my vocals. You don't want to be out of breath when you do the ballads. That's the kind of balancing act. I have things that I can do at home for keeping my voice together. I do karaoke singing, and I write songs a lot, and I do demos and sing them. I'm very lucky, in a lot of ways, because – I'm not trying to sound bigheaded – I do all the Rolling Stones songs in all the same keys as they always were in, so my higher end is still there, maybe better than it was, because I don't smoke anymore and I don't drink as much and whatever."