Jennifer Garner is working up a sweat.

The 51-year-old actress was spotted going out for a run in Brentwood, Calif. on Friday (July 21).

PHOTOS: Check out the latest pics of Jennifer Garner

Jennifer wore a grey t-shirt, black leggings and blue sneakers for her workout, pairing the look with brown sunglasses.

Earlier this week, it was reported that Jennifer would be reprising her role as Elektra in the upcoming Deadpool 3 movie, marking her first appearance as the character since 2005.

Jennifer also recently opened up about fame in a new interview, reflecting on the one thing she misses the most from her life when she wasn’t in the spotlight. Find out what she said here.

Click through the gallery for the latest photos of Jennifer Garner in a run in Brentwood…