This guy was a marine all his life and at the end of the video he said he didn't want to shoot the .44 mag a second time.
Actually, R. Lee Ermey was a a Marine for 11 years before receiving a medical discharge. Although he is a combat verteran, I have never seen any indication that he is an accomplished shooter, let alone one that has experience with heavily recoiling handguns. Judging by the fact that his left hand came completely off of the grip, and the way the gun recoiled, I would guess that he has either never shot truly powerful handguns, or that he was putting on a bit of a show for the camera. Either way, it is not representative of the level of recoil and it's effect on the shooter when proper shooting techniques are employed.
My nephew has been shooting since he was quite young, has been taught how to properly position his body and how to grip the gun to dissipate recoil. He is now 16 years old, and not above average in size, but has shot many heavy recoiling handguns for several years. Get some good instruction and start with milder loads before trying the heavy hitters. Dealing with recoil is learned, and it has little to do with physical size or strength.