Beginners in fitness often make several common mistakes that can hinder their progress. One significant error is having unrealistic goals, leading to frustration and potential burnout. Additionally, many newcomers do not warm up or cool down properly, increasing the risk of injury. Inadequate focus on proper form during exercises can also contribute to injuries and ineffective workouts. Furthermore, neglecting rest days can hinder recovery and performance. Beginners should prioritize education about fitness principles and listen to their bodies to create sustainable workout routines.