With reference to the narrative of events, far from permitting myself to derive it from the first source that came to hand, I did not even trust my own impressions, but it rests partly on what I saw myself, partly on what others saw for me, the accuracy of the report always being tried by the most severe and detailed tests possible. My conclusions have cost me some labor from the want of coincidence between accounts of the same occurrences by different eye-witnesses, arising sometimes from imperfect memory, sometimes from undue partiality for one side or the other.
Arthur De Vany
Your least frequent, most extreme exertions will have the greatest influence on your fitness. 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 half an hour of jogging. It's also the reason why lifting a weight heavy enough to make your heart pound and your muscles burn counts more than spending hours at the gym always in your comfort zone, never truly challenging your body. When a work-out becomes an unvarying, monotonous routine, it loses its effectiveness.
