Iwasada will be donating money to earthquake relief and youth baseball organizations in Kumamoto, his home prefecture. He will donate 100,000 yen for every game he wins and a box of rubber baseballs for every strikeout he records. The money will be donated in person, some time between November 2017 and January 2018.
Source: Hanshin 3/28/2017
Iwasada is throwing four kinds of balls (a regular baseball, a soft ball with stitching, a sponge ball, and a golf ball) as part of his training this winter. All of the balls, other than the golf ball, are about the same size. Throwing the different kinds of balls is supposed to help him find his optimal release point.