In the summer and winter breaks when I went to WIU (as well as the summer before going to WIU) I worked at a local grocery store. One of my duties was to collect the carts in the parking lot. I hope I do not get skin cancer; I did not wear a hat.
Pushing all that metal probably helped make me more fit, but I never really considered that as part of my transformation from couch potato to Mr Physical Fitness. I guess that is because it is not something I really chose to do. It was part of my job.
Sometimes I would only get one or two carts. Sometimes I would push in more than a dozen. (Sometimes with only one arm. Uphill. Really.) On Christmas Eve two of us would run all over the parking lot to get carts. We would have three carts between the two of us, and there would be at least four people waiting.