Girls' Generation's Sunny was found to be surprisingly less than limber on the latest episode of 'Roommate'!
 

She followed fellow 'Roommate' older sister Bae Jong Ok during one of her Pilates sessions, and quickly found herself over her head as Bae Jong Ok pushed her to try moreexercises! "We should come together twice a week," she told Sunny, who merely groaned in answer!

Check out the clip from 'Roommate' below.