Playing it cool: Elizabeth Olsen in a no-fuss outfit after a trip to the gym in Los Angeles on Monday.

The 5ft6in Marvel actress wore a black leather bag and carried a black jumping rope and a bottle of Essentia water.

Her baby blue trainers added a bit of color to the monochromatic ensemble.

The younger sister of celebrity twins Mary-Kate and Ashley Olsen first became known for her lead role in the 2011 film Martha Marcy May Marlene, about an escaped cult victim.

Staying fit: The Avengers star in her workout clothes in Los Angeles on Monday

Since then, she’s split her time between acclaimed independent films and her role as Scarlet Witch in The Avengers film franchise.

Disney, which owns Marvel Entertainment, has announced that the Avengers actress will star in a show for its forthcoming streaming service.

Elizabeth was also recently seen in the critically Sorry for Your Loss, a Facebook original series. She stars as a woman coping with the recent death of her husband.

Celebrating in style: The Wind River star at the Brooks Brothers and St. Jude Children’s Research Hospital’s Annual Holiday Celebration Beverly Hills on Sunday

The Avengers star is expected to reprise her role in the upcoming Avengers: Endgame.

The sequel to this year’s hit Avengers: Infinity War returns to the struggle to defeat Thanos, who devastated many of the classic Marvel heroes in the previous film.

Avengers: Endgame is set to be released on April 26, 2019.

For a good cause: Elizabeth is all smiles at the Brooks Brothers/St. Jude’s holiday benefit in Beverly Hills on Sunday