After a sparring session at the local boxing gym a few days ago, I was talking to an old-school boxing trainer (probably in his 70's) and he mentioned that I turned my back on my opponent a couple times. I know I didn't turn my back in a conventional sense, but I did use a few shoulder rolls. And I know, in a lot of sports, as years go on, the rules get bent further and further (basketball has almost become a contact sport; golf "woods" are made of steel; helmet-to-helmet tackles are probably more commonly seen than not in football), and it got me wondering, is the shoulder-roll one of those things? should it be considered turning your back on your opponent? Here's a video that highlights Floyd Mayweather's defensive skills, and in the first 40 seconds or so, it shows almost all shoulder rolls. If you'll notice, many times, his back is literally turned, which is kind of what makes it so difficult to hit him. Now, I don't want this to become a thread about how good Mayweather is or isn't. I just want to get your opinions on the technique. Would it have been considered back-turning 50 years ago? Should it be considered such nowadays?