Bah! We have an evil downstairs neighbor, so we're PLEASED when the kittens run around at top speed with their padding kitten feet. Just so you know, if you ARE on the second floor, they WILL bother a sensitive neighbor if they get into their heads that they want to run around. Your boys are probably old enough to be more sedate, but our kittens sound like super humanly fast running two-year-olds. XD