Trunks and Goten develop Kikoukenjutsu (Ki-Control Swordsmanship), becoming the origin of the present "Swordsman" class.
The "Katchin Can be Cut!" article in Gohan's "Groundbreaking Science" book had a large impact on practitioners all across the world. Trunks and Goten were aware of this phenomenon; "Swordmanship's cool—isn't it. Let's set up an awesome school all by ourselves!" The two became enthralled by this motivation. Via intense training, the two were able to develop their natural potential and establish a Kikoukenjutsu Sword School.