He says there's a connect between gymming and eating right.
"I've realised if you work hard in your gym, you will never eat junk, (and) you tend to cheat on your diet when you don't know the efforts put during workouts," Sonu tweeted Thursday.
From his washboard abs, one can make out the efforts he would have put in for `R...Rajkumar`.
On the work front, Sonu will next be seen in Farah Khan directed "Happy New Year", which also features Shah Rukh Khan, Abhishek Bachchan and Deepika Padukone.