While Goku is on Snake Way, the other Z-Fighters (Yamcha, Tien, Krillin, Chiaotzu) train in a virtual simulation at Kami's Lookout.
They face two past Saiyan warriors in a "Spirit Room" simulation and realize they are nowhere near strong enough yet to face the upcoming threat of Nappa and Vegeta. Dragon Ball Super (DBS): "Pan is Born!" TV REVIEW: Dragon Ball DAIMA – Episode 17: Gomah DragonBall_Ep_017.mp4
Building physical endurance and discipline rather than just learning techniques. Dragon Ball Daima: "Gomah " While Goku is on Snake Way, the other
Instead of fighting, they must deliver milk across the entire island on foot before breakfast. This includes running through forests and climbing massive flights of stairs. While Goku is on Snake Way