When I bought a hand-crank coffee grinder a few years ago, I started doing air squats during the time it took me to grind the beans. Now I can finish 15 to 20 squats while cranking enough for an espresso. It was the first time I was ever that consistent, and it made a huge difference in my glute strength and activation. Now I can't grind without doing squats. It's part of the same action in my mind.
Caspar Coppetti, one of the founders of On shoes in Switzerland, does clamshells while his espresso is brewing. "I'd like to just drink the coffee," he says. But he tells himself, "If you don't do the clams, you don't get the coffee." He credits the resulting strength and form improvement with saving his running.
Be creative, but find something you'll do that doesn't require a decision everyday. Make it part of your quotidian routine.
More: 5 Simple Moves For Long, Lean Legs