Inactive men who engaged in 4-minute sessions of high-intensity exercise three times a week showed significant improvements in fitness levels and blood pressure levels
A growing body of evidence shows that short bursts of high-intensity activity followed by periods of rest provide greater gains to your health than slow-and-steady longer workouts
The high-intensity exercise routine I recommend, Peak Fitness, involves going all out for 30 seconds and then recovering at a slower intensity for 90 seconds between sprints. The total workout is typically 8 repetitions for a total of four minutes of actual exercise.
You only need to perform high-intensity exercise for anywhere from four to 20 minutes, two or three times a week, for maximum benefits