Instagram post shows strong is the new skinny for model Nina Agdal

Strong is the new skinny: Model Nina Agdal shows off muscular back as she posts topless workout snap. Source:Instagram

MODEL Nina Agdal has taken to social media to flaunt her new sculptured and toned bod.

The 22-year-old Sports Illustrated cover girl posted a topless photo of herself showing her back muscles and biceps on Instagram yesterday.

“#progress skinny doesn't mean weak,” Agdal captioned the steamy picture.

Last week, she was snapped at a Kiehl’s Ride For Charity event in New York.

She barely broke a sweat as she worked out on an exercise bike alongside Entouragestar Jeremy Piven.

Work Out ... Nina Agdal and Jeremy Piven attend the Kiehl's Ride For Charity in New York City. Picture: Getty Source:Getty Images

If you check out her Instagram account, it’s not totally surprising that the 22-year-old beauty has one super-athletic bod.

Here’s a sneak peek.

Work it ... Agdal posted this sweaty post workout pic. Picture: Instagram Source: Instagram

Knock out ... Nina relaxes after a boxing session with a friend in NYC. Picture: Instagram Source: Instagram

Swimsuit ... Nina Agdal needs to keep in shape for photo shoots like these. Picture: Instagram Source: Instagram