Hollywood heavyweight: Joaquin Phoenix sports a bulkier physique as he attends a martial arts class in Los Angeles
It seems Joaquin Phoenix is on a mission to get in shape at the age of 40.
The Inherent Vice actor was seen leaving a martial arts class on Sunday in Los Angeles after working up a sweat.
Joaquin, who turned 40 last month, appears to have been displaying a bulkier frame since completing filming for his upcoming role as a college professor in Woody Allen's latest untitled film.
Pouching Tiger: Joaquin Phoenix left a martial arts class in Los Angeles on Sunday sporting a bulkier physique than usual
And the Gladiator star packed a slightly bigger paunch than usual and a somewhat fuller face as he left the fitness studio.
Barefoot and wearing white trousers and a red polo neck, Joaquin did look like he had been training hard.
His hair was swept back and the clean shaven actor protected his eyes from the sun with a pair of shades.
On a mission: Joaquin looked like he was in the zone as he left the gym following a tough workout
On a mission: The actor has been attending martial arts classes and going for hikes in recent weeks
Last month, Joaquin was spotted looking beefier than usual while out walking his dogs around Beverly Hills.
It's not known whether he is putting on weight for a role, but over the summer he shot a Woody Allen film with Emma Stone, which sees him play a small town college philosophy professor with an identity crisis who becomes embroiled in a love affair with a student.
In recent weeks, the Her star appears to have upped his exercise regime, attending martial arts classes and going for hikes.
Slimmer figure: The actor cut a thinner shape a year ago in the film Her
Joaquin is set to hit the big screen in December in upcoming comedy drama, Inherent Vice, in which he is reunited with his Walk The Line costar Reese Witherspoon.
Directed by Paul Thomas Anderson, the film also stars Owen Wilson and Josh Brolin.
Joaquin plays private investigator Larry 'Doc' Sportello, who is looking into the disappearance of his ex-girlfriend's boyfriend.
No shoes: Joaquin didn't seem affected by his lack of footwear, walking around barefoot
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