The people of Gujranwala hai some rich history of well build muscular guys many of them are considered as the Lords of Pakistan who have good name in the Body building industry
The guy in the first video is Baggu (Shahid Moughal) i knwo him personally lives near my home and now a days has opened his own GYM
the guy in the third video is Tousif butt an apprentice of Shahzad Ali (Guy in yellow jacket) and the guy of Arshad Moughal
i know them all very well burnt too many years in this industry and quit long back its all useless and injecting steriods is very hazardious
yes excercise is very good one should do it but the above is certainly not a good idea