Bad habits are the things we do often that aren't good for us. Like eating junk food, sitting too much, or not sleeping enough. Some people smoke cigarettes or drink too much alcohol, which can really hurt their health. Bad habits can also be small things, like biting your nails or spending too much time on your phone. The tricky part is that once you start doing these things a lot, they're hard to stop, even when you know they're not helping you be your best. The key is to try to swap them out for good habits, like eating veggies, getting exercise, or just taking a break to walk around if you've been sitting all day.