The Glee star looked gorgeous in her shocking pink leggings, matching trainers and simple black vest, and flashed a smile for photographers when they caught up with her on her run.
Lea's often seen out and about in the Hollywood hills, hiking or running in the sunshine.
She previously told Shape of her daily workouts: "I'm simple. I love hiking, going to the gym, doing simple stuff. I love being outdoors. I love bike riding. Just stuff that's fun!"
Life has been very busy for Lea lately as she's both filming new episodes of Glee and gearing up for the release of her debut album Louder in March.
The actress, who plays Rachel Berry in Glee, has been filming scenes for the show's upcoming 100th episode, which will see the return of previous guest stars Gwyneth Paltrow and Kristin Chenoweth.
Lea's late boyfriend Cory Monteith, who played Finn, will also be remembered in the episode. He died in July 2013 following an accidental overdose of alcohol and heroin. Glee paid tribute to him with a special episode last year.
Glee director Paris Barclay told Us Weekly: "There is so much feeling there and it affected the Glee family in such a profound way, and you can expect it to be dealt with in the 100th episode. It definitely comes back and is dealt with in a significant way."
Wow! Try REVEAL Mag for FREE on Android tablets!!! Find out more here
Got an iPad or iPhone? Reveal Mag is specially designed to fit!
Listen to Lea's single 'Cannonball' below: