Yondu, at least, isn't bad at it. He can't fuckin' fly or do any ninja shit, but he's gotten a whole lifetime worth of hardiness and his joints haven't given up yet! At least he's good for that.

"Yeah, I'll come with ya." He goes to get his pack, figuring it'd be better to escort Senku there. He's got a hell of a lot of hardass friends and could do better than Yondu but, eh.

Might as well make sure he doesn't get goat-butted into a voidhole or something.