Make-up free Elizabeth Olsen slips on sporty shorts as she works up a sweat on a gruelling hike

She's starring in the much-anticipated Marvel sequel Avengers: Infinity War 

And Elizabeth Olsen proved she's still in superhero shape as she powered through a hike in Runyon Canyon, Los Angeles, on Monday. 

The actress, 28, appeared slightly out of breath as she finished her trail, showing off her athletic frame in a loose fitting grey muscle top and sporty shorts.

Working up a sweat: Elizabeth Olsen proved she's still in superhero shape as she powered through a hike in Runyon Canyon, Los Angeles, on Monday 

Working up a sweat: Elizabeth Olsen proved she's still in superhero shape as she powered through a hike in Runyon Canyon, Los Angeles, on Monday 

The star completed the casual ensemble with black running trainers as she kicked off her week in a healthy fashion. 

Cooling down from her intense workout, the beauty wrapped her long chestnut tresses into a messy bun.

Shielding her eyes from the Californian sun in tinted round shades, the Ingrid Goes West star's natural complexion glowed as she went untouched by make-up.

A healthy start to the week: The actress, 28, appeared slightly out of breath as she finished her trail, showing off her athletic frame in a loose fitting grey muscle top and sporty shorts 

A healthy start to the week: The actress, 28, appeared slightly out of breath as she finished her trail, showing off her athletic frame in a loose fitting grey muscle top and sporty shorts 

Elizabeth took on the massive hike with songwriter beau Robbie Arnett - who she was first romantically linked to back in March.

The Oldboy star and Robbie became official in September, stepping out in public as a couple for the first time at the Gersh Emmy party in Los Angeles. 

Having grown up with child actresses-turned-fashion heavyweight sisters Mary-Kate and Ashley Olsen, 31, Elizabeth recently told The Daily Telegraph newspaper that she's used to being photographed out and about as it's 'all I've ever known'. 

Famous siblings: Having grown up with sisters Mary-Kate and Ashley Olsen, 31, Elizabeth recently told The Daily Telegraph that she's used to being photographed (pictured June 2016)

Famous siblings: Having grown up with sisters Mary-Kate and Ashley Olsen, 31, Elizabeth recently told The Daily Telegraph that she's used to being photographed (pictured June 2016)

Chatting to the publication in September, the talented starlet said:  'I understand that it's not that normal to be worried about being photographed, when you're growing up, by strange men around Los Angeles who are chasing you in cars. 

'It made me despise those kinds of people, it made me despise gossip magazines.'

Elizabeth's next outing will be as Scarlett Witch in the ultimate superhero match up, Avengers: Infinity War, due out on May 4.

In the hotly anticipated blockbuster, the combined forces of good take on Marvel's ultimate baddie, Thanos, to save the Universe. 

Star super hero: The star's next outing will be as Scarlett Witch in the ultimate superhero match up, Avengers: Infinity War, due out on May 4

Star super hero: The star's next outing will be as Scarlett Witch in the ultimate superhero match up, Avengers: Infinity War, due out on May 4

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Elizabeth Olsen works up a sweat in shorts in LA

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