|"The Kame Sen School's Tough Training"|
|Rōmaji||Kamesenryū no Kibishī Shugyō|
|Literal English||The Turtle Hermit School's Tough Training|
|Viz||It Only Gets Harder|
|Arc||Kame Sennin Training Arc|
|Japanese||July 2, 1985|
"The Kame Sen School's Tough Training" (亀仙流の厳しい修業, Kamesenryū no Kibishī Shugyō; Viz "It Only Gets Harder"; Literally meaning "The Turtle Hermit School's Tough Training") is the thirty-first chapter of Part I of the Dragon Ball manga.
Following their early morning training of delivering milk, Kame-Sennin reveals to Gokū and Kulilin of their morning training consisting of working in the fields with their bare hands. Afterwards, the three have a late breakfast, leading the people in the restaurant to be astonished by the amount of food consumed by the three.
Later on, the training consists of studying literature until lunchtime, taking a brief, one-hour nap afterwards, then helping out construction workers in order to build muscle and swimming. A frustrated Gokū demands that Kame-Sennin teach he and Kulilin how to fight, but the turtle hermit insists that the young boys cannot learn fighting techniques without tempering their bodies first and foremost with these various activities.
Thereafter, the three resume the training regimen by attempting to push a boulder. After Kame-Sennin pushes the boulder, while Kulilin doesn't considering doing so a possibility, Gokū is able to surprise the turtle hermit and his fellow disciple by pushing the boulder as well. After the rock-pushing exercise, Kame-Sennin has the boys perform dangerous tasks such as swimming with sharks, dodging bees, and finally ending the training by getting the boys to wear 20 kilograms shells on their backs for the rest of the training sessions.