Is anyone else bad at hiking or just me

Took my family to a trail last weekend and we were supposed to do a 2 mile easy walk. Turns out it was way steeper than the app said and my legs were DYING. My six year old was somehow fine but I was struggling hard. Had to sit down three times. My wife was laughing at me the whole time. We finally made it back after like 90 minutes and I went straight to bed. Not sure if that counts as exercise or just suffering.