One of the easiest and most accurate ways to increase your work out intensity while still training at a safe level is to monitor your heart rate during exercise. In order for this method to be effective you must first determine your max heart rate (220-age= MHR), the intensity in which you exercise is determined by a percentage of this number.
50%-60% of MHR for the average person is considered a warm up, but depending on your body composition and fitness level you may want to stay in this zone longer, you will come back down to this heart rate during your cool down as well.
70%-80% of MHR would be considered your training zone, this is where you want to be for the bulk of your cardio work out, depending on your training level you can last here for 15-40 minutes (longer for athletes.)
80%-90% of MHR is usually accomplished during interval training , this is when we exercise at a lower intensity for a set amount of time and then increase intensity for a set time then back and forth between the two. This is one of the most effective training methods, numerous studies have shown that exercisers using this method have lost more weight and burn more calories through out the rest of the day then those who exercise at a set intensity for a longer amount of time. Those new to fitness should first build up some cardiovascular endurance before beginning an interval training program as it can be a bit of a shock to the system.
Its important to know your heart rate so that you know whether or not you are over exerting yourself or not during exercise, this can be done by either pausing during activity and taking your pulse for 10 seconds and multiplying that number by 6, or more effectively with a heart rate monitor worn on the wrist.




