Muscle Toning: Kickboxing tones your upper and lower body through punching and kicking the bag. You will feel stronger each time you go. Increased Flexibility: Before starting, stretch for about 15 minutes to prepare your body to move. Kicking during the class will build flexibility too. Better Circulation: Kickboxing classes will get your heart rate going to increase circulation in your body. Stress Relief: Relieve your stress and anger on a punching bag during a kickboxing class! Full Body Workout: Save time by combining your cardio and resistance workouts during a kickboxing class. Defend Yourself: Kickboxing is great for general self-defense. You will build self-confidence as you become stronger.