High intensity cardio7/1/2023 ![]() This is the optimum zone for improving fitness and building muscle strength. When remaining in the lower end of the range, it is possible to sustain exercise for longer. "Physical activity at 60-70% helps to build endurance and takes the body into fat-burning mode – in this zone, 85% of the calories you burn are from fat," explained Mansour. Zone 2: 60-70% of MHRĪlso known as the 'temperate zone'. "It is a good range for improving overall health prior to exercising in the higher heart rate zones," said Mansour. When exercising for longer periods of time at low-intensity (LISS cardio) you would typically be in the upper end of this zone. This zone requires the least amount of effort and may be used for a warm-up and cool-down, or for active recovery sessions. ![]() There are five cardio heart rate zones that are categorized in exercise intensity from lowest (1) to highest (5): Zone 1: 50-60% of MHR Omar Mansour, a fitness trainer for WithU (opens in new tab), told Live Science: "Cardio heart rate zones are ranges based on percentages of your maximum heart rate (MHR), which is the maximum number of beats your heart can make per minute during exercise before it is under stress." ![]() This means you can elevate your heart rate to a specific level, for a set amount of time, depending on your goals and current fitness levels.Īs mentioned above, you can monitor your heart rate with the best budget fitness trackers (opens in new tab), but these are likely to give general estimates rather than completely accurate readings. According to the American Council on Exercise (opens in new tab) (ACE), it's an accurate way to gauge how hard the body is working during exercise in order to get the associated cardiovascular benefits, without putting a strain on your system.Īs explained by the MayoClinic (opens in new tab), the higher the intensity of exercise, the higher your heart rate, but training within heart rate zones enables you to prescribe consistent, measured effort to a workout. Using heart rate as a training metric is an effective method to improve health and fitness – and it's not a new concept.
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