He shocked fans by unveiling a much heavier frame on the set of upcoming comedy Arms and the Dudes last week.

But it seems Jonah Hill has turned over a new leaf since the funnyman was spotted enjoying the New York City sunshine during a bike ride along the West Side Highway on Monday.

The 31-year-old actor cut a sporty figure in an all-black outfit as he hit the pedals hard during his renewed health kick.

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Getting back on the bike! Actor Jonah Hill was enjoying a casaul ride along the West Side Highway cycle path in New York City on Monday

Jonah was wearing a polo shirt and skinny jeans as he indulged in some afternoon exercise on his Citi Bike.

The Wolf Of Wall Street star looked more like his usual self, with a baseball cap perched on his head and white trainers completing his look.

The Hollywood joker, who has been open about his battle with his weight, seemed to be enjoying himself during his leisurely afternoon off.

Leisurely cycle: The 31-year-old actor cut a sporty figure in his all-black outfit and baseball cap

It is not known whether Jonah has gained weight for his new Todd Phillps-helmed comedy, which also stars Miles Teller and is scheduled for release in 2016.

The lovable actor's weight has yo-yoed over the years and he famously slimmed down dramatically in 2011, shedding 40lbs from his 250lbs frame.

He thanked his Moneyball co-star Brad Pitt for encouraging him to get healthy at the time, revealing a nutritionist and a diet of Japanese food helped him stay trim.

What a transformation: Jonah unveiled a much larger frame on the set of his new film Arms And The Dudes in Burbank, California last week (left), a marked contrast to his slimmed down physique in 2011 (right)

Jonah also confessed he wanted to slim down for the sake of his family, who were concerned about his health and wanted him to forsake his former frat boy lifestyle.

'Being healthier came along with maturity,' he told Vulture in 2011. 'And it’s hard, because a lot of times people want you to be the guy you were when they met you.

'And I love doing funny movies, but I want to mature, literally, in how I treat myself.'