A fit grandmother and her equally fit granddaughter have taken the internet by storm.

Lesley Maxwell, 63, and her 18-year-old granddaughter Tia Christofi have joined forces to demonstrate a killer workout routine while wowing fans with snaps showing off their bodies.

The grandmother, from Australia, has over 34,900 followers on Instagram where she shows off her incredible physique.

Recently, the bodybuilder shared a workout clip with her granddaughter Tia which left people in awe over their jaw-dropping physique.

The grandmother captioned the post: “Toning that upper body with this quick and effective workout with my fit granddaughter.”

A number of people reacted, asking the older woman what she eats to stay in shape.

One fan gushed: “Lesley you can’t have such a body! It is not known who is the granddaughter or grandmother.

“Can you put recipes of what food you eat? Obviously, complemented with exercises. Thank you.”

Another added: “Two beautiful strong young ladies.”