Jennifer Lawrence arrives at the gym on Monday morning (August 13) in Santa Monica, Calif.

The 21-year-old actress has been hitting the gym hard, in preparation for the upcoming The Hunger Games: Catching Fire which is expected to start shooting soon.

Maria Howell was just added to the cast as Seeder, a former Hunger Games winner from District 11.

Katniss (Lawrence) takes a liking to Seeder the moment they meet, when Seeder gives Katniss vital information about the families of Rue (Amandla Stenberg) and Thresh (Dayo Okeniyi).

10+ pics inside of Jennifer Lawrence…