What is the "progressive overload principle" in weight training?

What is the "progressive overload principle" in weight training?

John Spencer Ellis (Author, TV Show Host, Trainer and CEO, National Exercise & Sports Trainers Association) gives expert video advice on: How do I design a strength training program?; How often each should I train each muscle group?; How much weight should I use when I train? and more...

Overload, or progressive overload principle, is a systematic approach to gradually adding more weight than you're currently using in your resistance training or weight training method. And the theory behind progressive overload principle is your body acclimatises, and once it acclimatises, it already has figured out how to do it. Both neurologically and physiologically, the body learns how to handle that workload. So you have to progressively overload the muscle. This progressive overload then takes your body, takes your fitness, takes your muscle, to the next level, and it's done a progressive manner, and it's called progressive overload.