A regular habit is a behavior or practice that someone does on a consistent and frequent basis. It's something that they do routinely, without fail, as part of their daily routine or schedule. This could be anything from brushing your teeth twice a day to exercising every morning, reading before bedtime, or taking a walk during lunch break. The key is that it becomes an automatic and ingrained behavior that doesn't require much effort or thought because the person has done it so often. A regular habit can be good or bad depending on what it is, but generally speaking, developing positive habits can greatly improve one's productivity, health, and overall well-being.