Infielder Koki Yamaguchi, an infielder for Lotte, a professional baseball player, is working on batting practice with an awareness of how to apply force to the abdominal muscles in order to strengthen his long-hitting power at a camp held in Ishigaki Island, Okinawa.

Lotte's Yamaguchi was among the teams with the lowest slugging percentage in the league last season, and hit 16 home runs, the team's top.



On the 8th, as a practice aimed at improving long-hitting power, I worked on batting practice while holding a balloon in my mouth, which was taught by Hodaka Yamakawa of Seibu, who did voluntary training together during the off period.



By swinging the bat after blowing into the balloon, you can be conscious of how to apply force to your abdominal muscles and hit a powerful ball.



In the free batting after that, in addition to hitting a strong ball in the center direction that he was conscious of, there was also a ball that went over the fence in the left direction.



Yamaguchi said, "I didn't realize it until last season, and I feel that my flight distance has increased. I want to hit 30 home runs this year."