Uh-huh - that is right.
My own experience with crushing cans? I was a runt, so I didn't crush cans when I was a kid. Not even when I was a "big kid" in high school. I joined the Navy in '75, made a couple cruises, and during that time, aluminum cans became ubiquitous. (The Navy had them everywhere, at least.) I came home one summer weekend, and visited an uncle's bar. There were a couple people in there that I knew from high school - one growing fat and soft, another who looked pretty good shape. We all had Iron City beers, which were still in steel cans. Fat guy crushed his can with some strain. The other guy crushed his with less strain. These guys were jocks in high school - they used to crush those cans effortlessly. Me? The runt? I never could crush those cans with one hand. Imagine my own surprise, when I actually crushed that stupid steel can, apparently with less effort than either of the other guys.
Yes, it took either strength, or real effort to crush those steel cans. Personally, I didn't have that strength until I was about 22 or 23, with a few years of hard life at sea behind me.
And, I'm sitting here, right this moment, wondering If I could crush a can today. No - I'm not as strong as I was back in '78, '79, and '80. I developed even more muscle after I got out of the Navy, but the past decade has been pretty sedentary, and I'm not in the same shape anymore.