Trunks was just getting done moving all the furniture out from where it'd been stored in the room, and was just about to start dusting. Good timing Rose. A blink, and a hint of smile. At least she hadn't snuck up on him. "Lots of practice."

Saiyans were originally from a planet that had 10x Earth's Gravity, so tended to have more endurance and stamina. Even with that part of his heritage blocked, as a demi-saiyan, he was used to working hard and going until he dropped.