Lenny Kravitz reveals the simple test he uses to know if he's still fit at 62

Lenny Kravitz may be one of rock's fittest stars, but he says he doesn't need an expensive fitness tracker to stay in shape.

Instead, the Grammy winner relies on one brutally honest test that's never failed him — whether he can still squeeze into a pair of 28-inch-waist pants.

Kravitz, who's known for his shirtless performances and sculpted physique, revealed that his waist size remains the ultimate indicator of his health — and it came from a fellow Hollywood heavyweight.

LENNY...