Hi ,
Aerobic exercises are more to burn calories, reduce body fat percentage and improve endurance. If you want to do aerobic exercises then make it alternate days with resistance training exercises. Try lifting maximum weight you can for 12 counts and 2 sets. Dont do aerobic exercises more than 40 min at a time. And do resistance training exercises for 25 min targeting two muscle group at a time. Resistance training exercises helps to build muscle mass and thus muscle will replace fat. If you combine this exercises with your aerobics then there is no wrong doing aerobic exercises.