This is the reflection of Kang Ji-man, the 2006 Shinhan Donghae Open champion, and a trade secret kept in his training journal for over 20 years.
It can be said to be a collection of knowledge and lessons gained from playing on tour and running an academy and mentoring many people after retirement.
We've compiled content that's easy to understand and tailored to the needs of all golfers, from amateur golfers just starting out to professional golfers on tour.

The subtitle is 'The World's Easiest Brain Science of Golf'.
Based on golf and brain science, we have compiled and organized the principles and phenomena of golf that are permeated by brain science.
As the title suggests, this is a golf book that you can easily and conveniently take out and read whenever you miss a shot.
There is also a lot of fun to be had looking at golf healing photos by professional golf photographer Taeseong Park.
The concept is to understand while reading and to heal while looking at pictures.
It's one book, but it's actually two books.

As we age, our muscles decrease and our range of motion decreases.
It's a natural phenomenon.
However, you don't have to focus solely on strength training to improve your lost muscle strength.
Flexibility exercises to maintain the elasticity of connective tissue are more important than strength training.
If you lack flexibility, you won't be able to properly utilize the strength your muscles have.
To compensate for this, you end up using unnecessary muscle and strength.
The more this happens, the more sloppy the swing becomes and the less distance is gained.
It's easy to understand when you look at the wooden swings of middle-aged and older amateur golfers.
--- p.43

Resting requires just as much effort as exercising.
Think about whether you usually finish your training and return home or to your accommodations to get some quality rest.
During your break, spending long hours browsing the internet on your smartphone, browsing social media, texting on mobile messengers, watching YouTube videos, or watching movies or dramas on Netflix is ​​not a quality rest.
When you do this, your brain doesn't perceive it as rest.
I'm using up my energy by being active like I was when I was training.
Instead of resting, I feel more tired.
--- p.79

It shouldn't end with just waking up early in the morning.
You need to be in the best condition early in the morning.
In medical terminology, there is a term called level of awakening.
It refers to the degree to which one has awakened from sleep and regained consciousness.
The reason we practice going to bed early and waking up early is to optimize our level of arousal.
--- p.145

Anyone who plays a round of 18 holes makes countless mistakes.
The same goes for professional golfers.
Even if it seems like you're playing perfectly, it's not.
If you ask professional golfers about their rounds after a game, you'll rarely find someone who says, "I played perfectly today."
An 18-hole round ends after making countless mistakes and going through all kinds of hardships.
It's full of mistakes.
If we just cover up those many mistakes without checking them, then of course there will be no progress.
Reviewing is absolutely necessary to find the cause of the mistake that day and have time for reflection and introspection.
--- p.154

Our brains can't focus on two things at once.
While it's possible to do two things simultaneously, such as watching TV while eating, it's difficult to expect the best results from quality immersion.
When you exercise while listening to music, the energy that should be focused on exercising and moving your body is diverted towards listening to the music.
This means that the energy that should be focused on exercise is diverted elsewhere.
--- p.224

In order to swing like this, you need to change your usual practice method.
For example, it is better to plan how many swings you will make per club than to plan how many hours you will practice your swing.
If you practice for a set time, you will have to practice your swing according to the time, so it is more likely to be about filling time rather than acquiring accurate technique.
--- p.234

Why does the brain make it a habit to procrastinate on exercise, even though it causes more stress?
Because the human brain prefers instant gratification.
They react quickly and sensitively to short-term, immediate gratification rather than long-term goals.
That's why we have a hard time resisting the temptation of things that provide instant pleasure, such as drugs, smoking, and alcohol, even though we know they are not good for our bodies.
--- p.348~349

To exercise effectively, you must repeatedly practice the correct swing.
Even if you only practice swinging a few times, you must execute them with the correct form.
To do this, you need a coach who can correct your incorrect swing motion.
This way, you can increase your learning effectiveness and reach your destination in the shortest possible time without having to take a long detour.

--- p.364