Ryuma Kidokoro has not taken a single day off from training since the 2013 off-season. He does not like taking the day off because it gets harder to get back into the workouts the following day.
Kidokoro worked with weight five to six times a week until last year. He now works with weights about twice a week because he wanted to focus on speed and flexibility. He also found that he was still able to hit the ball far.
Source: Sponichi 6/21/2016
Kidokoro is think about wearing glasses during the 2017 season because he has trouble seeing out of his left eye when the lights are low (from 1.2 to 0.7).
Source: Nikkan Sports 12/12/2016