Common myths associated with fitness and exercise include the belief that lifting weights makes women bulky, which discourages strength training. Another myth is that spot reduction is possible - targeting fat loss from specific body areas through exercise, which is scientifically unsupported. Additionally, many believe that only intense workouts lead to results, while moderate exercise can also provide significant benefits. Misunderstanding the role of recovery days, hydration, and nutrition in fitness success can hinder progress as well. Addressing these myths is crucial for effective health habits.