When you think of Dwayne Johnson being in the right shape to play MMA fighter Mark Kerr, you probably don't envision him having to gain weight. The professional wrestler turned actor has the nickname "The Rock" for a reason.
But, for his upcoming movie The Smashing Machine in which Johnson portrays Kerr in his prime MMA days, he was told he had to gain weight to make his body look accurate. He underwent a 12-week training camp with MMA coaches and fighters in order to reach the ideal body image to portray Kerr.
