This article in TOI suggests that Amir went to the gym for months in the past year and apparently got the above look. It's weird coz during all the publicity interviews for Taarey Zameen Par when Amir was apparently building his body, not once did he seem to be hiding such bisceps and shoulder blades and triceps under his T-Shirt!
This one I really got to see. As of now, it seems like a morphed image; time will tell.
