For fitness enthusiasts who need a little cardio variety, HIIT (or high-intensity interval training) has long been a popular choice. According to a study in Biology of Sport, HIIT — which pairs short ...

HIIT workouts may improve blood sugar and blood pressure as well or better than moderate-intensity workouts can, according to Harvard Health. 3. You’ll burn calories during—and after!— ...

Forever tired after exercise ... muscular endurance than HIIT. This could manifest as muscular fatigue in strength-training novices. If you’re still shattered a few months in, I wonder how ...