Hop On Pop
Kids are restless beings, and they spend most of their time running around, screaming, jumping, etc. majority of the day. The only time they get a break, or you get a break from them, is during a nap or bedtime. Unfortunately, bed and naptime come and go like the wind. You have to deal with their hyperactive selves till you are no more.
This is a simple way to relay this information when a friend without kids asks this triggering question. The best you could do is recommend this book and turn it to this page exactly. This page mainly describes your daily parenting struggles. Hyperactive kids who have a very long battery life are no joke.