Naomi Campbell has surprised fans by sharing her entire workout session on Instagram. (Getty Images)

She may be 50 years old – but Naomi Campbell has proven she’s far fitter than most half her age.

The supermodel has surprised fans by sharing her full home workout routine in a post on Instagram.

Speaking directly to the camera from inside a well-equipped gym, the star – who is currently staying in Kenya – says: “Good morning! Rise and shine! Let’s work out!”