Do I want to be the guy picking up aluminum cans and glass bottles out of the road ditch on a busy highway? Not really. But I’m really glad there are people who do.
That's most of what I do, as it happens.
Since my body gave out, a long walk is the best exercise I can get. But the advantage (over running 10k) is that I can wear a backpack with a (reusable) bottle of water and disinfectant wipes.
I pick up bottles and cans (every few hundred yards in Professorville, and) every few feet in Campustown. I'm rarely far from a recycling bin.
Once I get to Campustown, I spend most of my stopped time moving boxes and bottles from dumpster to recycling bins, usually about three feet away. It's not uncommon that a dumpster is completely filled because four to six big boxes are occupying all the space. Once I've removed them, people have a place to put their trash!
Occasionally, while breaking down a box, I'll notice a 3lb bag of potatoes, etc. But I can usually tell when a dumpster is filled with an apartment's worth of stuff. Bedding is a giveaway. And of course, some people pile their stuff near a dumpster, and maybe even attach a sign that says "FREE."