As tends to happen about once or twice a year, tweaked my lower back 3 Fridays ago on the 2nd to last rep of a hard workout. Wasn't particularly bad and was still able to do so most of my workouts the following week, but then I totally re-aggravated it on the crunch machine last Monday, just when I thought I was fully 100% again. Had some rough days last week and was only able to do low-impact cardio and light lifting that didn't involve bending my back too much. Feeling pretty good again, but definitely gonna ease back into the routine this week. Still kinda stiff when I get up from sitting too long or riding in my truck.
Last time I really had this issue was around Memorial Day last year, and then I started getting much better about stretching every day. Had 7-8 months with no issues, which of course led to getting lazy about my stretching. I just have to drill it in my head that I'm damn near 40, and despite having a pretty consistent exercise routine, I simply have to do things properly or I'm gonna keep having problems.