Consistent with the topic, my 57-year old body has been fighting a lower back strain for about a month, following a particularly strong (or so I thought) set of deads (5x5 at 315). I warmed up before doing them, and didn’t feel anything until two or three days later, but then the pain was nearly debilitating. One side of my lower back, extending into my oblique. So I forced myself to take two weeks off and become a blob. I haven’t had to do that in years, so it was a truly depressing couple of weeks. Eased back into everything except deads, but I’m still 10-15% below where I was in strength and clearly more bodyfat, and the back isn’t perfect–still aches in that one area after each workout.
For me, the key to avoiding this situation is 5-6 workouts a week. I’ve been getting 2-3 because of work, and that’s not enough for me, at my age, to avoid injury. Also, I’m going to concentrate on core strengthening–especially abs–because that supports one’s back, and for me, it’s always been a weak point.