"Ah'm not really a runner," Violet said, not really liking the idea of running. Running where? It was going from one place to another and it wasn't like one place or the other was good about it. She'd prefer to stay inside. It's likely what contribute to her pale skin as well, but Violet wasn't concerned about getting a good tan or trying to get that runner's high.
She added, "Thanks for the offer though. But it just ain't my thing." She could at least be honest with Sebastian in that respect.