[quote
ost_uid0="princevegetam"]they all know martial arts, it's just too low level for them. they've perfected that and evolved beyond that. they're perfecting their air combat techniques. and those energy attacks can be used on the ground. it's not directed at the ground so no harm is done to themselves. as for vitality, they've got the most vitality! do you realize that battle with the saiyans went on for a whole day! 24 hours! why? because king kai said it had to take goku a day to get there in time.[/quote]
Some of that day was used for resting, and taunting the opponent. Besides, theres the senzu bean which recovers your vitality. And Vegeta didn't fight the whole time, for most of the hours he just watched, and Nappa was beaten by Goku, and killed by Vegeta which wasnt the whole saiya-jin fight.
The only person who lasted through the whole fight(and that fought) was Krillin, and he was revitalized with the senzu bean, and plus he missed some of the goku vs. vegeta fight.