Planks and glute-targetting exercises for me. Little but often when I'm in the mood - better than doing a big hit every few weeks.
The main thing to to make sure you're doing things with the correct technique. For me, mostly bodyweight seems sufficient (I'm trying to be a runner, not a gym bunny) but add a theraband/kettlebell to add resistance when required.

Got a bit of lower-back ache shortly before my BG last year. A few sets of reverse hyperextensions over the sofa arm sorted it right out - AthleanX on youtube is a ripped brash yank, but his videos seem to have nipped any small issues I have had in the bud.