The most confusing thing to many people who don’t yet understand Vince Gironda’s principles is understanding why Vince advocated training so fast.
After all, most people in the gym just think they have to lift as much weight as possible to a grow big muscles.
A succinct explanation can be found in an article Vince called “Developing Muscle”: “…to acquire larger muscles, you must increase the intensity of work done within a given time. This means minimum rest between sets. (Push yourself.) I feel workouts should be timed, and constantly strive to shorten the time it takes to get through your routine. (This is a form of Progressive Resistance.) It does not matter how much work you do. What counts is how fast you do it. This is known as the ‘overload principle.”
The overload principle explains why sprinters have larger leg development than long-distance runners. It is more work to run a mile than 100 yards, but the sprinter is doing more work per second.