Tip: the next time you put on your bike shoes, take just a minute to check the tightness of the screws in your cleats. They can very easily work loose over time, especially if you've been riding all year (or longer!) and have never stopped to inspect them.
Why this is important: Losing a screw while you're riding is at the very least an inconvenience. You'll have to replace it to keep your shoe working like it should. Having several that are loose can be much worse. A loose cleat can make you fall if your foot slips out during a hard pedal. Or you may have to walk some distance if your cleat separates partially or all the way from your shoe.
How to do it?: Simple. With the right-sized allen wrench, which should be standard equipment in any cyclist's seat bag, simply tighten the screw down into the shoe until it is seated firmly and tightly again, and the cleat is not able to be wiggled around on the base of the shoe.