Turtle School (Kame-sen'nin)
Master Roshi · Work, study, eat, rest, repeat
Roshi's training is almost aggressively unglamorous. Goku and Krillin deliver milk, plow fields, swim through dangerous water, dodge hazards, study and perform everyday labor while wearing weighted turtle shells.
He is not rushing them toward a secret finishing move. He is building stronger bodies, better endurance and the discipline to keep training without making fighting their entire lives.
The Breakdown
Roshi's lesson is to train hard, study hard, eat and rest properly, then enjoy life too. The
Kamehameha is his famous technique, but the foundation is what makes his students dangerous.
Crane School (Tsuru-sen'nin)
Master Shen · Tien · Chiaotzu · Assassin's discipline
The Crane School is the dark mirror of Roshi's teaching. Master Shen produces technically gifted students and techniques that become permanent parts of Dragon Ball's combat language, but he aims that talent toward domination, cruelty and assassination.
Tien and
Chiaotzu arrive at the 22nd Tenkaichi Budokai carrying that philosophy with them. Tien's eventual break with Shen matters because the training itself is not portrayed as worthless; what he rejects is what Shen taught him to do with it.
The Breakdown
Dodon Ray, Bukujutsu and the Kikoho lineage all make the Crane School influential long after Tien stops obeying the Crane Hermit.