Common cardio mistakes can reduce the effectiveness of your workouts and slow progress. Doing too much cardio without enough recovery can lead to excessive fatigue. Poor form or incorrect technique may also increase unnecessary strain on the body. Training at the same intensity every time can limit improvements and make workouts less effective. Ignoring warm-ups, cool-downs, hydration, or proper nutrition can also affect performance. Understanding these mistakes can help you make your cardio training safer and more effective.