United Kingdom, Feb. 22 -- Lenny Kravitz puts in a "tremendous amount of work" to look younger than his age.

The 60-year-old singer has "never felt physically better" in his life but puts it down to workouts in the middle of the night and FaceTime sessions with his personal trainer.

When it was suggested that he is getting "better with age", he told The Times: "I have to say it's true. That's not ego, that's: I've never felt physically better in my life. But that's by virtue of a tremendous amount of work.

"The other night I was in the gym at 2.30 in the morning. I was working all day. My trainer [Dodd Romero], he's like, 'Man, you are crazy. People don't understand. They see the result, but they don't understand that you're in the gym...