You’ll start each cardio day with Tabata-timed cardio. The HIIT protocol that follows calls for sprinting “on the minute,” meaning that your sprints and active rest will always add up to a minute. You’re free to choose your method of cardio, but treadmill running has been shown to burn more calories than cycling. In the first workout, perform 10 all-out 12-second sprints, with 48 seconds of active rest. This will amount to 120 seconds of total sprinting. The next time out, do more: 11 sprints at 13 seconds each, with active rest diminishing by a second. You can expect a similar uptick in volume each cardio session.
Frequent and sustained cardio training is one of the best ways to burn fat and boost metabolism. One of the best cardio exercises to perform is running, according to the American College of Sports Medicine, as it burns a high number of calories per hour and improves cardiovascular health. ACSM recommends training five days a week, with a minimum of 60 minutes per session.
In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.