Roger the kangaroo has made a triumphant return to social media

Roger the kangaroo is back - and it looks like he's been working hard in the gym.

The musclebound red kangaroo saddled up for a photo with a fearsome flex, trademark biceps bulging and veins popping out of his immensely sculpted forearms.

He's come a long way since being picked up as a tiny orphaned joey sitting on the side of the road beside his dead mother back in 2006.

Now Roger entertains the masses who come to visit him at The Kangaroo Sanctuary Alice Springs in the Northern Territory.

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Roger the Kangaroo made a triumphant return to social media on Friday, posing for a menacing photo

The red kangaroo made headlines last year when he was photographed crushing a metal bucket with his paws

He has earned a reputation as one of the fiercest kangaroos alive - weighing a whopping 89 kilograms

Roger's latest pose - bent over on his stocky hind legs and lips locked in a fierce grimace - was uploaded across the sanctuary's social media accounts on Friday.

'After a summer break we reopened this week for our guided sunset tours. Here is Roger enjoying the attention of our visitors!,' the caption read.

Weighing in at a mammoth 89 kilograms and standing 2.007 metres from tip to tail, Roger rises a head above the rest of his mob whom he fiercely protects.

Roger made headlines last year when photos emerged of him eyeballing a camera while he crushed a metal bucket with his bare paws.

Soft side: Roger isn't afraid to show his sensitive side, cuddling tightly on two of his favourite play-toys

Sanctuary manager Chris 'Brolga' Barnes says Roger is a master of kickboxing and is trained in hand-to-hand combat

Poser: Roger loves to prop up his huge chest and flex his biceps for the camera

Since then, sanctuary manager Chris 'Brolga' Barnes has relished in the marsupial's newfound fame, uploading photos to show the sanctuary's near-300,000 followers more of Roger's personality.

In one shot Roger has his body propped upright as he rests his front legs on a boxing bag.

Another image reveals Roger propping his chest forward as he reaches upwards to nibble on the leaves of an overhead tree.

While Roger puts on a tough front, he's really a bit of a softy.

He's often pictured hugging tightly on his two favourite play-toys, a soft Easter bunny and Santa.

In June of last year, Brolga told Daily Mail Australia that Roger was trained in hand-to-hand combat and could disembowel his opponent with a well-placed kick.

'His daily exercise regime is sparring [kickboxing] his rivals and chasing his human 'Mum', me,' Brolga told Daily Mail Australia.

'He also loves crushing metal buckets.

'Don't mess with a "Big Red" [red kangaroo], they'll disembowel you... or worse.'

'His daily exercise regime is sparring [kickboxing] his rivals and chasing his human 'Mum', me,' Brolga (left) told Daily Mail Australia

'Mmmm ... protein': Roger is pictured snacking on some leaves off an overhead tree branch