Actor Aamir Khan, who is known for undergoing image transformation for his onscreen role, has gained 22 kg to weigh 90 kg for his upcoming film 'Dangal'. The actor is playing a wrestler in 'Dangal', based on the life of Mahavir Phogat and his wrestler daughters Geeta, Babita and Sangita. Aamir is also learning wrestling and Haryanvi for the film.