He practiced stretching all year round to enhance the flexibility of the Futures League players. However, nothing changed as much as he put effort into it. At that time, Haitai had several soft-bodied pitchers. Sun Dong-yeol, Lee Kang-cheol, and Jo Gye-hyun were particularly flexible.

What I felt at that time was that it was very important to develop the flexibility of the body at a young age. The growth engine as well as the life of the player changes depending on the direction and fidelity of the body when you are young. What Sun Dong-yeol, Lee Kang-cheol, and Cho Gye-hyun had in common was the softness they had in their bodies since childhood.

I recently saw some really impressive kids. I had a chance to watch the team's players train on the field, and it was amazing that there is still a place where they train like this. The kids dragged their tires around their waist and ran around to get outfield punches. In that condition, they tried diving catch.

Flexibility comes from the lower half of the body. Children at school naturally strengthened their lower body. These days, most teams pay more attention to weight training. They put much more effort into strengthening their upper body than their lower body. As a result, pitchers are often slow at the tips of their cheeks even though they have a fastball. In addition, many pitchers use upper body strength to achieve ball speed and their control shakes.

Not long ago, I heard that Daewon Middle School co-winned a national championship. It is said that the school's children finish by weighting after outdoor training. If you look at the training process, I think it's the best.

I remember when I was a freshman at Katsura High School in Kyoto, Japan. That year, I visited a local public bathhouse every day. It was for training. They used to build lower body strength in daily life while running around hills and riding mountains, but that year, they went into the public bath and trained to create wrist flexibility together every day. I repeated the same movement 1,000 times a day in the water. After a year like that, I became a different person without realizing it. I became a pitcher rapidly. I developed softness in my wrist and felt light throwing balls.

Recently, I saw a pitcher who was designated by a high ranking team to throw a ball this year. His ball speed was good, but his ball control was not. Based on his form, I was also worried about his injury. Unfortunately, he expressed softness. He also used the lower half of his body. That's why he gave me advice on several things including wrist training.

If you lack lower-body strength, you depend on your upper body. The burden comes quickly on your shoulders, too. If you use enough of your lower body when throwing a ball, your hand comes out the latest. The tip of the ball that you throw like that comes alive. Sun Dong-yeol had a hard lower body and soft upper and lower bodies. As if pulling and dropping the bowstring to the maximum, he dragged himself to the lower body as much as possible and his hand came out late. He had strength at the end of his ball.

Lee Dae-ho is still soft when batting. When he was at Softbank in Japan, he said, "You're not running," and he said, "I'm running a lot. I played far in the outfield 10 times today as well." Lee Dae-ho was really good at the end of the season of the strongest baseball last year, and he saw him run every day then. Lee appears so light that he doesn't seem to exert much effort when swinging. The reason he is so soft is that he knows how to use his strength from the bottom.

Sun Dong-yeol, Lee Kang-chul and Lee Dae-ho have in common that they played without injury for a long time. All of them used lower bodies well. All of them were soft.

Shin Seong-kwon, a professional baseball pitcher who played in the strongest baseball league, threw 150 kilometers of balls, but he needs to improve his ball control. This winter, he made sure to run a lot and perform flexible gymnastics steadily. Not long ago, however, he threw 10 balls, but seven to eight balls ended up in the zone. I thought, "I see," at the time. As expected, the basic ingredients are lower half of the body. In order to grow into a baseball player, you need to use these balls well. What is more important than training and playing less is how to do it.

These days, I often watch winter indoor sports on TV. A few days ago, I was watching women's volleyball, and I slapped my knee when I saw Kim Yeon-koung hit the ball. Kim Yeon-koung spiked, and her elbow and wrist were very flexible as if a good pitcher threw a breaking ball. The ball trajectory changed automatically like a sharply bent slider. There were several scenes where the opponent had a hard time whenever he received the ball.

Kim Yeon-koung also had her lower body firmly supported, and her upper body softness made her number one in women's volleyball. "This is how it penetrates all sports events."

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