by Zoë Pollock
The Pareto principle, named for Italian economist Vilfredo Pareto, holds that "the most unusual events will have the greatest impact." Art De Vany, author of The New Evolution Diet, applies the law to exercise:
The peak moments of a workout count far more than the amount of time you spend working out. This is why a series of 40-yard sprints at full speed benefits you more than a half an hour of jogging. It’s also the reason why lifting a weight heavy enough to make your heart pound your your muscles burn counts more than spending hours at the gym always in your comfort zone, never truly challenging your body. When a workout becomes an unvarying, monotonous routine, it loses its effectiveness.