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Essentially, when you engage in high intensity exercise, this is classified as anything where your heart rate is exceeding 90% of its maximum. That means you’re working as hard as you can and placing a massive demand on your body’s systems to supply energy. That in turn means that you’re going too fast for your body to rely on the aerobic system – which is what it uses when you engage in regular ‘steady state’ cardio (cardio training where you jog at a relatively slow pace.