Common barriers to maintaining a fitness routine include lack of time, motivation, and resources. Busy lifestyles can make it challenging to find consistent opportunities for exercise, while external commitments often take priority. Psychological factors like self-doubt, stress, and fear of failure can hinder motivation, causing individuals to abandon their fitness goals. Additionally, inadequate access to facilities or equipment, financial constraints, and a lack of social support can pose significant obstacles. Identifying and addressing these barriers is crucial for developing sustainable fitness habits.