Basically this means that when the body is stressed by high intensity training beyond its normal demands, the body will adapt to these new demands of improved strength.
When I say "normal demands," I mean what level of stress/strength your body is used to now.
An example: The set that you performed last week using the same technique and weight, your body will now have adapted to. If you stay at this level your muscles will not become stronger or bigger, so this is where the Progressive Overload plays a major part.
Once your muscles have adapted to a particular weight then it'll be time to overload them further (add more weight, speed, repetitions). You'll need to keep on repeating this process of overload if you want to become stronger.
Remember to always use ‘Good Technique’ Technique must never be sacrificed for extra load.
3. Training Frequency
The sad reality is that the popular high volume type of training that you find in bodybuilding books and magazines (and used by the stars) is irrelevant to the majority of the population and has a shocking failure rate.
What is good for Joe Star is probably not good for you. Everybody has different genetics; most of us have poor genetics and are not taking steroids like the stars.
The only way the majority of us can make any gains at all is to perform short intense workouts followed by long periods of rest so that we don't overtrain.
4. Over-Compensation
Many studies conducted around the world have shown clearly that recuperation from strength training requires far more rest time than previously thought.
Infrequent, short, high intensity weight training sessions, followed by the required amount of time to recover and become stronger is necessary for you to increase your functional muscle.
Here's what you need to do - allow your body enough recuperation time for over compensation to take place, so that the muscles can adjust to their new strength and growth.
5. Exercise selection for intensity
I can't stress enough of how exercise selection is absolutely crucial. There are only a few exercises that you really need to perform. These exercises consist of multi-joint movements.
These particular exercises are far superior to that of isolation exercises (working 1 muscle group at a time) because you are required to use more muscles from every muscle group.
By using these exercises your whole body will be worked hard.
6. Visualization
Over my 20 years in the industry, I've noticed that this area is by far the most neglected by mainstream health and fitness professionals...
Most books or courses concentrate on the physical side of muscle gain or fat loss and completely neglect the mental side of things.
By training your mental state as well as your physical body you can even further progress in muscle growth.
Now that you know these strength-training principles put them to the test straight away and stop wasting your time in the gym.