There's a moment of hesitation, of a frown on his brow, and when he speaks it's hesitant. "...yes?" Because he does want to go and train, but also it was nice to have time with her, especially in such a location when alone time was so limited. Considering he's far from a public person when it came to how he expressed himself around her, having that limited time compressed even more into shorter and smaller segments was frustrating. He can't fully relax with so many others around. Training was something at least he could do anywhere, to some degree, and that offered some comfort in its familiarity.

He's also realizing that's not the answer she would be wanting from this. Even he's not that dense on this front. Vegeta opens his mouth to answer, then closes it again, trying to figure out what to say. "It-" Hnnngg, why you make him have to say such things, Bulma. "It's not like I don't like this."