Got back home last night from an epic national park tour capped off with a climb/hike of Angel's Landing in Zion with my oldest. My oldest, 9, hiked everything my wife and I did, about 20 miles in the ten days we were gone. My middle, almost 7, hiked about 15 miles. Youngest, 4.5, did a few miles by himself too. Darn proud of my sons so far.