Common barriers to maintaining a fitness routine include lack of time, motivation, resources, and knowledge. Busy lifestyles often lead to prioritizing other commitments over fitness, while motivation can wane without visible results. Financial constraints may limit access to gyms or classes, and individuals may struggle to create balanced workouts. Overcoming these barriers can involve setting realistic goals, finding enjoyable activities, leveraging community support, and utilizing free or lower-cost resources. Addressing these challenges can facilitate a more consistent and sustainable fitness journey.