I measure the kids regularly during the year-start of school, January, end of school. Since school ended Jillian grew 1 and 1/4th inch this summer. She looked at the mark today and said, "Wow, am I that tall?" Bridget grew the same amount this summer.
We found some roller skates at a garage sale and Jillian practiced a lot today with just one sit-down hard. She then had me follow her around right behind her to catch her, just in case. The deck is a little rough so it's good to practice there as the skates don't roll as fast.