Cardio workout is beneficial when a person must lose weight and excess body fat. At least 30 minutes of cardio workout should be included in daily routine. Cardio workout activities for blasting calories and getting in great shape are the following: jogging, walking, hiking, dancing, cycling, rollerskating, skiing, step aerobics, most sports with ball (soccer, handball, tennis ) basically all sports that include some sort of body moving and that make your heart beat faster, are considered cardio workout. Even weightlifting: if your strength training includes many repetitions with low weights, we are talking about cardio training. Bodybuilders for example make low number of repetitions (for example 5), but they lift very heavy weights.
If your goal if weight loss, you should include in your daily workout routine 30 minutes of cardio workout and at least 15 minutes of workout with light weights-dumbbells (up to 3 pounds in each hand). I wouldn't call this strength workout but more like a toning training, because you are not really building strength with light weights, but you are toning and shaping your arms, legs and waist.