Add an additional 15 minutes of fat burning cardio to each workout. Try sprinting or increasing resistance. Go all out for 30 seconds then back to baseline for the next 30 seconds. Continue for 15 minutes.
The American College of Sports Medicine recommends that all healthy adults should do the following:
1. Frequency of training: three to five days per week
2. Intensity of training: 55/65%-90% of maximum heart rate
3. Duration of training: 20-60 minutes of continuous or intermittent aerobic activity
4. Mode of activity: any activity that uses large muscle groups, which can be maintained continuously and is rhythmical and aerobic in nature (for example, walking-hiking, running-jogging, cycling, bicycling, cross-country skiing, aerobic dance/group exercise, rope skipping, rowing, stair climbing, swimming, skating, and various endurance game activities or some combination thereof).
Regular cardiovascular exercise is key to keeping up with your overall health and fitness.