The model-actress was trained under Pilates instructor Namrata Purohit.
"Everyone's admiring my look in my debut film 'Karle Pyaar Karle', and that's all because of my core strength and agility that Pilates and altitude training has given me," Hasleen said in a statement.
The training taught her how to exercise the right muscles.
She said that at Namrata's studio she learnt that "it's not necessary to burn yourself by lifting unnecessary heavy weights or doing crazy amount of cardio, it's just about exercising those muscles in the right amount with correct posture."
Directed by Rajesh Pandey, the love story will also mark the acting debut of Shiv Darshan.