What did you do?
My 11 YO son and I took a road trip about 2 months ago, driving to Las Vegas via Southern Utah. One of those days was spent canyoneering outside of Zion NP.
The hike in was 2 1/2 miles, and we gained about 1000 feet in elevation. On the way out, we did 5 rappels, ranging from 40-90 feet.
I thought I was in good shape, but the hike in was exhausting. For next year's trip, I'll put some serious time on a stair-stepper.
Apologies in advance should this picture drop: