3: Shane Carwin
Shane Carwin is without a doubt one of the most monstrous Heavyweights to compete in the UFC. A collegiate wrestling champion and a double engineering degree holder, Carwin worked as an engineer while pursuing his MMA career.
The giant from Colorado soon became a force to reckon with in the sport, finishing all his opponents violently before beating Frank Mir to become the UFC Interim Heavyweight Champion. His hands have given fans some of the most vivid knockouts, which include him hitting Christian Wellisch so hard that his mouthpiece went flying across the octagon and of course, the "six inches of death" that anasthaetized Gabriel Gonzaga.
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Carwin retired from MMA in 2011 because of several injuries, but faced pro-skateboarder Jason Ellis in a freakshow fight in 2016. Carwin had one had tied behind his back but still knocked out Ellis in the 2nd round. Here's a video of Carwin deadlifting 220 kg for reps when training to face Brock Lesnar at UFC 116: