Common habits that hinder fitness progress include a lack of consistency, poor nutrition, and insufficient sleep. Neglecting to schedule workouts can lead to missed sessions, while unhealthy eating patterns can affect energy levels and recovery. Additionally, skipping rest days and not allowing the body to recover can lead to injuries, further derailing progress. Emotional eating, stress, and a negative mindset can also affect motivation and performance. Recognizing these habits is crucial for making positive changes and establishing a more effective fitness routine.