That you can’t lose weight effectively just by walking, and you won’t build muscle just by walking. You can lose a f**k ton of weight just walking an hour every day. A nice brisk pace, go and see the ducks or something. It’s fun and accessible and it will make your butt look nice (because despite what some people may also believe, your leg muscles do actually do work when walking! Shocker!)
Also great for posture and pain and your mental health. Especially if you’re walking outside. Also you get to go see ducks.
TL;DR: ducks.