Why don’t all Sayian train like this?
Vegeta makes it clear in the Frieza saga that when a Sayian gets beat within an inch of their life, then they recover, they get a significant power increase. It doesn’t have to be through fighting either, as shown when he got Krillin to blast him and Dende to heal him. Given this, why don’t they train like this at all times? Imagine a year in the hyperbolic time chamber where you just get almost killed then eat a Senzu bean, multiple times a day for a year. You’d become a god in one earth day’s time.
Edit: I think y’all fundamentally misunderstand my post. I’m saying if Vegeta and Goku said “this is how we’re gonna train in the hyperbolic time chamber,” then they took a bucket of Senzu beans in there- then Goku blasts Vegeta and nearly kills him, then gives him a Senzu bean immediately- then visa Versa. Repeat multiple times a day for a year.