My epiphany has been lazy glutes (see context below). What's yours?

I've been running for about a decade (marathon in 2015, tons of half marathons and 10ks before and after). I consider myself a decent runner, PR pace for half ~7:50/mile and PR pace for 10K ~7:40/mile.
BUT, I just learned something significant. I've had lazy glutes all this time. When running or doing strength work, my glute muscles basically only ever engage when they have to. Which causes excess strain on quads, hams, knees, calves, low back....basically everything. And I've just started to more mindfully engage the glutes both while running, dynamic warm ups, and strength training. It's night and day. It'll require a little training up, but I'm sure it'll help me speed up a bit as well as avoid unnecessary injuries and tightness.

EDIT:
Since a lot of questions have been asked how to engage glutes, Here's a good video.
As for me personally, I've benefited from flexing squeezing glute muscles when I'm running, walking, stairs, etc. And during dynamic warmup movements. And, especially, during strength training. And I go slower in strength training and really focus mindfully on glute engagement/squeezing - sometimes placing my hands there so I can feel it engage (both glute maximus and, especially, glute medius)
You'll know it's working because your glutes will get a lot more sore. And your other muscles will feel better because they arent working as hard.